I added custom music to my resourcepack.

"music.01":"music.01": {"sounds": [\{"name":"resourcepack:music/01","stream": true}]}

And I turned it on through a command in the console

/playsound resourcepack:music.01 ambient @a ~ ~ ~ 1

Despite volume 1, I hear music at any distance from the launch point.

If I run the music from the vanilla game with the same command, then moving away from the launch point, the sound will fade out.

/playsound minecraft:music_disc.11 ambient @a ~ ~ ~ 1

UPD: I changed the stereo channel in the file to a mono channel and the sound stopped sounding all over the world and began to fade out smoothly.