If a jukebox is playing a disc and destroyed with commands such as /setblock or /fill, then the music will still continue playing.
Music Disc still plays, even when it dissapears.
/fill makes the disc disappear and doesn't stop playing the song
When an active jukebox is replaced using the /setblock command, the music continue playing
Music disc plays after replacing jukebox with air
Music disc sometimes continues playing after being taken out of the jukebox; audio can overlap