Disc track is playing, but there is no jukebox

I was messing around in an ancient city when i decided to play discs 11, 13, and 5 at the same time. I was offset so i stopped the discs. I then decided to play several discs at once and summon a warden with /summon.
As expected, 10+ discs played at once did not sound good, so I took all the discs out of the jukeboxes. 
For some odd reason, I could still hear the track 'ward' playing, so I broke the jukeboxes and I can still hear it. WHAT DID I DO?

Youtube link: https://www.youtube.com/watch?v=Bze71YC83eI&feature=youtu.be

Idk why this happened, but low priority.