Some very strange behavior occurs with jukeboxes when multiple players spam music discs into a jukebox, Keep in mind that the second video involves a player in creative mode, which is why there were so many music discs. 

Basically, when two or more players spam a jukebox, it has the potential to play both discs at once, losing one of the discs in the process. In addition, the music continues after the jukebox is broken.

https://youtu.be/Ssx5S4AYOyg

https://youtu.be/3dNqEYjMeCU