Earlier today, I started up a world in the new Minecraft snapshot and decided to start building.
Right off, I noticed a very annoying bug: Multiple songs started playing at once.
I had done nothing besides modify my video settings and mess around with a few of the visual filters beforehand.

If anyone needs more info, tell me.
No screenshots available; this was an audio bug, not a visual bug.

I will include a F3+C crashlog for you guys, just in case you happen to need it.

First off, the shortened version from the launcher itself:

---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 10/18/13 3:40 PM
Description: Manually triggered debug crash

java.lang.Throwable
at ayw.o(SourceFile:1382)
at ayw.ad(SourceFile:755)
at ayw.e(SourceFile:706)
at net.minecraft.client.main.Main.main(SourceFile:103)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at bir.a(SourceFile:284)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [biw['ButterNoms'/515, l='MpServer', x=34.41, y=109.32, z=-103.09]]
Chunk stats: MultiplayerChunkCache: 225, 225
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (0,4,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 28371 game time, 28371 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 407 total; [vt['item.tile.dirt.default'/11, l='MpServer', x=42.13, y=106.13, z=-85.16], vt['item.tile.dirt.default'/12, l='MpServer', x=41.59, y=106.13, z=-87.03], vt['item.tile.dirt.default'/13, l='MpServer', x=46.91, y=106.13, z=-86.88], vt['item.tile.dirt.default'/14, l='MpServer', x=42.50, y=105.13, z=-82.50], vt['item.tile.dirt.default'/15, l='MpServer', x=40.91, y=106.13, z=-82.88], vt['item.tile.dirt.default'/17, l='MpServer', x=43.44, y=105.13, z=-82.28], vt['item.tile.dirt.default'/16, l='MpServer', x=44.31, y=105.13, z=-81.06], vt['item.tile.dirt.default'/19, l='MpServer', x=45.88, y=105.13, z=-81.44], vt['item.tile.dirt.default'/18, l='MpServer', x=42.72, y=105.13, z=-81.00], vt['item.tile.dirt.default'/21, l='MpServer', x=41.13, y=104.13, z=-80.63], vt['item.tile.dirt.default'/20, l='MpServer', x=43.41, y=104.13, z=-80.88], vt['item.tile.dirt.default'/23, l='MpServer', x=41.13, y=105.13, z=-76.44], vt['item.tile.dirt.default'/22, l='MpServer', x=39.13, y=106.13, z=-79.69], vt['item.tile.dirt.default'/25, l='MpServer', x=40.16, y=106.13, z=-76.22], vt['item.tile.dirt.default'/24, l='MpServer', x=39.50, y=106.13, z=-78.72], vt['item.tile.dirt.default'/27, l='MpServer', x=43.28, y=104.13, z=-77.13], vt['item.tile.dirt.default'/26, l='MpServer', x=44.63, y=104.13, z=-79.00], vt['item.tile.dirt.default'/29, l='MpServer', x=43.22, y=104.13, z=-78.41], vt['item.tile.dirt.default'/28, l='MpServer', x=43.72, y=105.13, z=-76.13], vt['item.tile.dirt.default'/31, l='MpServer', x=41.13, y=104.13, z=-78.41], vt['item.tile.dirt.default'/30, l='MpServer', x=46.25, y=106.13, z=-78.50], vt['item.tile.dirt.default'/34, l='MpServer', x=46.91, y=107.13, z=-52.78], ur['Horse'/516, l='MpServer', x=34.41, y=107.00, z=-103.09], vt['item.tile.dirt.default'/35, l='MpServer', x=46.63, y=106.13, z=-50.59], vt['item.tile.dirt.default'/32, l='MpServer', x=46.63, y=106.13, z=-76.50], vt['item.tile.dirt.default'/33, l='MpServer', x=45.63, y=105.13, z=-77.19], vt['item.tile.dirt.default'/512, l='MpServer', x=98.88, y=104.13, z=-40.81], vt['item.tile.dirt.default'/513, l='MpServer', x=96.66, y=103.13, z=-40.38], vt['item.tile.dirt.default'/42, l='MpServer', x=60.22, y=105.13, z=-83.06], vt['item.tile.dirt.default'/43, l='MpServer', x=58.13, y=105.13, z=-87.56], up['Chicken'/40, l='MpServer', x=60.53, y=107.00, z=-128.44], up['Chicken'/41, l='MpServer', x=62.66, y=107.00, z=-123.47], vt['item.tile.dirt.default'/46, l='MpServer', x=59.56, y=105.13, z=-85.31], vt['item.tile.dirt.default'/47, l='MpServer', x=57.28, y=106.13, z=-84.22], vt['item.tile.dirt.default'/44, l='MpServer', x=58.81, y=106.13, z=-84.03], vt['item.tile.dirt.default'/45, l='MpServer', x=59.16, y=106.13, z=-80.41], vt['item.tile.dirt.default'/51, l='MpServer', x=63.38, y=106.13, z=-87.56], vt['item.tile.dirt.default'/50, l='MpServer', x=62.69, y=105.13, z=-86.47], vt['item.tile.dirt.default'/49, l='MpServer', x=63.34, y=105.13, z=-84.75], vt['item.tile.dirt.default'/48, l='MpServer', x=57.25, y=106.13, z=-88.25], vt['item.tile.dirt.default'/55, l='MpServer', x=62.81, y=106.13, z=-88.88], vt['item.tile.dirt.default'/54, l='MpServer', x=56.13, y=106.13, z=-84.56], vt['item.tile.dirt.default'/53, l='MpServer', x=56.81, y=106.13, z=-86.09], vt['item.tile.dirt.default'/52, l='MpServer', x=57.13, y=106.13, z=-89.53], biw['ButterNoms'/515, l='MpServer', x=34.41, y=109.32, z=-103.09], vt['item.tile.dirt.default'/59, l='MpServer', x=63.78, y=106.13, z=-81.13], vt['item.tile.dirt.default'/58, l='MpServer', x=57.47, y=106.13, z=-82.94], vt['item.tile.dirt.default'/57, l='MpServer', x=60.16, y=105.13, z=-84.53], vt['item.tile.dirt.default'/56, l='MpServer', x=59.34, y=105.13, z=-86.59], vt['item.tile.dirt.default'/63, l='MpServer', x=59.31, y=106.13, z=-75.16], vt['item.tile.dirt.default'/62, l='MpServer', x=57.97, y=106.13, z=-74.59], vt['item.tile.dirt.default'/61, l='MpServer', x=61.13, y=104.13, z=-73.59], vt['item.tile.dirt.default'/60, l='MpServer', x=57.31, y=106.13, z=-66.88], vt['item.tile.dirt.default'/68, l='MpServer', x=52.34, y=104.13, z=-68.97], vt['item.tile.dirt.default'/69, l='MpServer', x=55.88, y=105.13, z=-67.13], vt['item.tile.dirt.default'/70, l='MpServer', x=52.09, y=105.13, z=-68.69], vt['item.tile.dirt.default'/71, l='MpServer', x=52.50, y=104.13, z=-71.25], vt['item.tile.dirt.default'/64, l='MpServer', x=61.56, y=106.13, z=-76.34], vt['item.tile.dirt.default'/65, l='MpServer', x=63.13, y=103.13, z=-75.88], vt['item.tile.dirt.default'/66, l='MpServer', x=62.75, y=103.13, z=-74.34], vt['item.tile.dirt.default'/67, l='MpServer', x=51.38, y=104.13, z=-69.59], vt['item.tile.dirt.default'/76, l='MpServer', x=50.13, y=105.13, z=-67.13], vt['item.tile.dirt.default'/77, l='MpServer', x=50.97, y=106.13, z=-71.63], vt['item.tile.dirt.default'/78, l='MpServer', x=54.25, y=106.13, z=-65.84], vt['item.tile.dirt.default'/79, l='MpServer', x=57.09, y=105.13, z=-68.91], vt['item.tile.dirt.default'/72, l='MpServer', x=53.88, y=104.13, z=-68.81], vt['item.tile.dirt.default'/73, l='MpServer', x=55.06, y=104.13, z=-70.75], vt['item.tile.dirt.default'/74, l='MpServer', x=55.72, y=106.13, z=-65.53], vt['item.tile.dirt.default'/75, l='MpServer', x=54.19, y=104.13, z=-70.59], vt['item.tile.dirt.default'/85, l='MpServer', x=57.13, y=103.13, z=-67.13], vt['item.tile.dirt.default'/84, l='MpServer', x=58.00, y=102.13, z=-70.41], vt['item.tile.dirt.default'/87, l='MpServer', x=61.78, y=101.13, z=-68.91], vt['item.tile.dirt.default'/86, l='MpServer', x=61.25, y=102.13, z=-72.88], vt['item.tile.dirt.default'/81, l='MpServer', x=55.03, y=104.13, z=-68.88], vt['item.tile.dirt.default'/80, l='MpServer', x=56.19, y=106.13, z=-71.22], vt['item.tile.dirt.default'/83, l='MpServer', x=59.97, y=101.13, z=-68.84], vt['item.tile.dirt.default'/82, l='MpServer', x=50.63, y=105.13, z=-69.88], vt['item.tile.dirt.default'/93, l='MpServer', x=58.84, y=103.13, z=-72.16], vt['item.tile.dirt.default'/92, l='MpServer', x=58.13, y=101.13, z=-70.88], vt['item.tile.dirt.default'/95, l='MpServer', x=61.06, y=102.13, z=-72.00], vt['item.tile.dirt.default'/94, l='MpServer', x=60.84, y=101.13, z=-68.03], vt['item.tile.dirt.default'/89, l='MpServer', x=57.13, y=102.13, z=-69.13], vt['item.tile.dirt.default'/88, l='MpServer', x=61.81, y=101.13, z=-70.81], vt['item.tile.dirt.default'/91, l='MpServer', x=58.13, y=102.13, z=-67.13], vt['item.tile.dirt.default'/90, l='MpServer', x=60.47, y=101.13, z=-71.44], vt['item.tile.stonebrick'/102, l='MpServer', x=63.13, y=86.13, z=-61.19], vt['item.tile.stonebrick'/103, l='MpServer', x=62.56, y=94.13, z=-54.19], vt['item.tile.dirt.default'/100, l='MpServer', x=58.16, y=101.13, z=-68.53], vt['item.tile.dirt.default'/101, l='MpServer', x=63.25, y=101.13, z=-73.94], vt['item.tile.dirt.default'/98, l='MpServer', x=59.53, y=101.13, z=-67.88], vt['item.tile.dirt.default'/99, l='MpServer', x=60.25, y=101.13, z=-69.75], vt['item.tile.dirt.default'/96, l='MpServer', x=60.53, y=101.13, z=-66.19], vt['item.tile.dirt.default'/97, l='MpServer', x=59.16, y=101.13, z=-66.53], vt['item.tile.stonebrick'/110, l='MpServer', x=62.41, y=81.13, z=-56.66], vt['item.tile.stonebrick'/111, l='MpServer', x=63.63, y=81.13, z=-57.19], vt['item.tile.stonebrick'/108, l='MpServer', x=62.00, y=81.13, z=-54.69], vt['item.tile.stonebrick'/109, l='MpServer', x=63.16, y=81.13, z=-53.44], vt['item.tile.stonebrick'/106, l='MpServer', x=61.88, y=81.13, z=-57.88], vt['item.tile.stonebrick'/107, l='MpServer', x=61.13, y=81.13, z=-57.88], vt['item.tile.stonebrick'/104, l='MpServer', x=61.13, y=92.13, z=-57.78], vt['item.tile.stonebrick'/105, l='MpServer', x=62.13, y=83.13, z=-58.88], vt['item.tile.flower1.dandelion'/119, l='MpServer', x=48.94, y=106.13, z=-51.72], vt['item.tile.dirt.default'/118, l='MpServer', x=49.56, y=105.13, z=-49.47], vt['item.tile.dirt.default'/117, l='MpServer', x=49.13, y=105.13, z=-53.16], vt['item.tile.stonebrick'/116, l='MpServer', x=63.53, y=81.13, z=-52.13], vt['item.tile.stonebrick'/115, l='MpServer', x=63.47, y=81.13, z=-56.22], vt['item.tile.stonebrick'/114, l='MpServer', x=62.97, y=83.13, z=-52.13], vt['item.tile.stonebrick'/113, l='MpServer', x=61.59, y=85.13, z=-57.88], vt['item.tile.stonebrick'/112, l='MpServer', x=62.00, y=81.13, z=-53.16], vt['item.tile.dirt.default'/127, l='MpServer', x=55.75, y=106.13, z=-63.88], vt['item.tile.dirt.default'/126, l='MpServer', x=55.13, y=105.13, z=-62.69], vt['item.tile.dirt.default'/125, l='MpServer', x=56.88, y=100.13, z=-61.88], vt['item.tile.dirt.default'/124, l='MpServer', x=51.13, y=101.13, z=-58.88], vt['item.tile.dirt.default'/123, l='MpServer', x=52.13, y=100.13, z=-59.88], vt['item.tile.dirt.default'/122, l='MpServer', x=48.78, y=105.13, z=-50.22], vt['item.tile.dirt.default'/121, l='MpServer', x=49.03, y=106.13, z=-52.59], vt['item.tile.dirt.default'/120, l='MpServer', x=52.06, y=100.13, z=-50.34], vt['item.tile.dirt.default'/137, l='MpServer', x=50.38, y=101.13, z=-50.13], vt['item.tile.dirt.default'/136, l='MpServer', x=55.63, y=100.13, z=-49.28], vt['item.tile.dirt.default'/139, l='MpServer', x=54.91, y=99.13, z=-52.13], vt['item.tile.stonebrick'/138, l='MpServer', x=54.06, y=100.13, z=-49.13], vt['item.tile.dirt.default'/141, l='MpServer', x=53.63, y=101.13, z=-48.66], vt['item.tile.dirt.default'/140, l='MpServer', x=50.91, y=101.13, z=-51.31], vt['item.tile.stonebrick'/143, l='MpServer', x=54.34, y=100.13, z=-51.72], vt['item.tile.stonebrick'/142, l='MpServer', x=53.13, y=99.13, z=-53.13], vt['item.tile.stonebrick'/129, l='MpServer', x=56.13, y=98.13, z=-54.13], vt['item.tile.stonebrick'/128, l='MpServer', x=58.22, y=98.13, z=-55.28], vt['item.tile.dirt.default'/131, l='MpServer', x=55.34, y=101.13, z=-48.75], vt['item.tile.dirt.default'/130, l='MpServer', x=51.13, y=101.13, z=-49.13], vt['item.tile.dirt.default'/133, l='MpServer', x=51.13, y=101.13, z=-57.59], vt['item.tile.dirt.default'/132, l='MpServer', x=50.97, y=106.13, z=-55.88], vt['item.tile.dirt.default'/135, l='MpServer', x=50.59, y=101.13, z=-49.28], vt['item.tile.dirt.default'/134, l='MpServer', x=52.41, y=100.13, z=-54.22], vt['item.tile.stonebrick'/152, l='MpServer', x=61.94, y=100.13, z=-52.50], vt['item.tile.stonebrick'/153, l='MpServer', x=63.66, y=99.13, z=-52.38], vt['item.tile.dirt.default'/154, l='MpServer', x=50.13, y=102.13, z=-57.41], vt['item.tile.stonebrick'/155, l='MpServer', x=54.13, y=98.13, z=-55.19], vt['item.tile.dirt.default'/156, l='MpServer', x=54.09, y=100.13, z=-60.41], vt['item.tile.dirt.default'/157, l='MpServer', x=52.16, y=101.13, z=-61.81], qz['Experience Orb'/158, l='MpServer', x=56.84, y=98.25, z=-59.56], vt['item.tile.stonebrick'/159, l='MpServer', x=52.69, y=99.13, z=-57.50], vt['item.tile.dirt.default'/144, l='MpServer', x=50.13, y=101.13, z=-53.44], vt['item.tile.dirt.default'/145, l='MpServer', x=54.44, y=100.13, z=-49.16], vt['item.tile.dirt.default'/146, l='MpServer', x=56.16, y=101.13, z=-50.88], vt['item.tile.dirt.default'/147, l='MpServer', x=49.13, y=102.13, z=-52.13], vt['item.tile.dirt.default'/148, l='MpServer', x=54.78, y=100.13, z=-51.09], vt['item.tile.stonebrick'/149, l='MpServer', x=52.81, y=100.13, z=-50.44], vt['item.tile.stonebrick'/150, l='MpServer', x=51.72, y=100.13, z=-53.75], vt['item.tile.stonebrick'/151, l='MpServer', x=62.63, y=99.13, z=-53.09], vt['item.tile.stonebrick'/171, l='MpServer', x=59.38, y=98.13, z=-56.88], vt['item.tile.stonebrick'/170, l='MpServer', x=53.13, y=98.13, z=-57.88], vt['item.tile.stonebrick'/169, l='MpServer', x=55.44, y=99.13, z=-54.38], vt['item.tile.stonebrick'/168, l='MpServer', x=56.09, y=98.13, z=-59.59], vt['item.tile.dirt.default'/175, l='MpServer', x=50.50, y=105.13, z=-47.75], vt['item.tile.dirt.default'/174, l='MpServer', x=48.97, y=106.13, z=-45.75], vt['item.tile.dirt.default'/173, l='MpServer', x=51.53, y=105.13, z=-47.50], qz['Experience Orb'/172, l='MpServer', x=54.91, y=98.25, z=-57.03], vt['item.tile.stonebrick'/163, l='MpServer', x=56.50, y=97.13, z=-56.75], vt['item.tile.stonebrick'/162, l='MpServer', x=54.53, y=98.13, z=-58.88], vt['item.tile.dirt.default'/161, l='MpServer', x=55.09, y=101.13, z=-62.88], vt['item.tile.dirt.default'/160, l='MpServer', x=52.31, y=103.13, z=-61.38], vt['item.tile.stonebrick'/167, l='MpServer', x=54.94, y=99.13, z=-59.59], vt['item.tile.stonebrick'/166, l='MpServer', x=58.56, y=98.13, z=-57.53], qz['Experience Orb'/165, l='MpServer', x=58.25, y=98.25, z=-60.75], qz['Experience Orb'/164, l='MpServer', x=58.44, y=98.25, z=-60.75], qz['Experience Orb'/186, l='MpServer', x=62.75, y=99.25, z=-44.25], qz['Experience Orb'/187, l='MpServer', x=62.25, y=99.25, z=-44.75], vt['item.tile.dirt.default'/184, l='MpServer', x=62.31, y=102.13, z=-40.13], vt['item.item.coal'/185, l='MpServer', x=62.53, y=99.13, z=-44.44], vt['item.tile.dirt.default'/190, l='MpServer', x=62.91, y=101.13, z=-43.13], vt['item.tile.dirt.default'/191, l='MpServer', x=61.66, 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vt['item.tile.dirt.default'/419, l='MpServer', x=89.44, y=105.13, z=-49.13], vt['item.tile.dirt.default'/418, l='MpServer', x=86.38, y=102.13, z=-48.19], vt['item.tile.stonebrick'/421, l='MpServer', x=84.56, y=98.13, z=-62.22], vt['item.tile.dirt.default'/420, l='MpServer', x=87.25, y=102.13, z=-63.13], vt['item.tile.stonebrick'/423, l='MpServer', x=85.88, y=98.13, z=-63.81], vt['item.tile.stonebrick'/422, l='MpServer', x=85.88, y=98.13, z=-62.59], vt['item.tile.dirt.default'/468, l='MpServer', x=98.75, y=105.13, z=-64.53], vt['item.tile.dirt.default'/466, l='MpServer', x=96.41, y=106.13, z=-68.88], vt['item.tile.dirt.default'/467, l='MpServer', x=96.41, y=105.13, z=-66.19], vt['item.tile.dirt.default'/464, l='MpServer', x=97.25, y=106.13, z=-67.78], vt['item.tile.dirt.default'/465, l='MpServer', x=97.69, y=105.13, z=-66.63], vt['item.tile.dirt.default'/458, l='MpServer', x=83.91, y=102.13, z=-47.72], vt['item.tile.dirt.default'/457, l='MpServer', x=95.56, y=102.13, z=-40.81], vt['item.tile.dirt.default'/454, l='MpServer', x=84.78, y=103.13, z=-41.91], vt['item.tile.dirt.default'/451, l='MpServer', x=86.63, y=106.13, z=-44.22], vt['item.tile.dirt.default'/450, l='MpServer', x=91.13, y=103.13, z=-42.28], vt['item.tile.dirt.default'/510, l='MpServer', x=96.81, y=103.13, z=-41.25], vt['item.tile.dirt.default'/511, l='MpServer', x=97.84, y=104.13, z=-43.88], vt['item.tile.dirt.default'/505, l='MpServer', x=97.13, y=106.13, z=-51.53], vt['item.tile.dirt.default'/506, l='MpServer', x=98.50, y=106.13, z=-51.59], vt['item.tile.dirt.default'/489, l='MpServer', x=98.22, y=105.13, z=-53.88], vt['item.tile.dirt.default'/487, l='MpServer', x=97.16, y=106.13, z=-53.03], vt['item.tile.dirt.default'/481, l='MpServer', x=96.38, y=104.13, z=-63.47], vt['item.tile.dirt.default'/480, l='MpServer', x=96.25, y=105.13, z=-62.13], vt['item.tile.dirt.default'/482, l='MpServer', x=97.38, y=105.13, z=-62.09]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bir.a(SourceFile:284)
at ayw.b(SourceFile:1938)
at ayw.e(SourceFile:715)
at net.minecraft.client.main.Main.main(SourceFile:103)

– System Details –
Details:
Minecraft Version: 13w42b
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 5406016824 bytes (5155 MB) / 6174015488 bytes (5888 MB) up to 7635533824 bytes (7281 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx8G -Xms6G
AABB Pool Size: 35670 (1997520 bytes; 1 MB) allocated, 3 (168 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 13w42b
LWJGL: 2.9.0
OpenGL: GeForce GT 520/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2112 (118272 bytes; 0 MB) allocated, 20 (1120 bytes; 0 MB) used
Anisotropic Filtering: On (4)

And second, the full crash log is attached to the post itself.

Do note that this is a clean copy of Minecraft. No modifications have been made to this installation in any way.

Thanks for checking this out and trying to help.