During usage of a Jukebox in Minecraft it was discovered that when spam putting in and taking out of a CD in a jukebox, it would play multiple tracks of the audio featured on the CD. An example being when the CD "C418- Stal" was spam placed in and taken out 20 times, "C418- Stal" played 20 times though severely out of sync. It is also worth mentioning that said 20 Tracks of music featured on "C418- Stal" would play even if the CD was taken out including also when the Jukebox was destroyed. The numerous tracks would eventually still continue on until they all went though their entire audio. 

Please note this bug was discovered on 1.16.4 and on an Aternos.org Free Minecraft server so it is possible that this is featured only on Aternos.org servers in that particular version.