Jukebox Sound Overlap

Whenever I put a music disc into a jukebox it overlaps with the Minecraft background music.

What I expected to happen was...:
The background music should stop and play the disc.

What actually happened was...:
The disc music and the Minecraft music overlapped, playing one on top of another. I tried this with the only three music discs I have, 13, Cat, and Pigstep, and it all did this.

Steps to Reproduce:
1. Get a music disc (And make sure music is playing in the background of Minecraft)
2. Put it into a jukebox and listen to the overlap