Background music will (very rarely) merge with another song

LET ME CLARIFY SOMTHING!!!
People have already reported various issues regarding the background music, especially with the jukeboxes. This is relating to the music like calm 1, creative 1, etc. This is about music MERGING not repeating.

What happened:
I was playing regular minecraft, building a house and such and I all of a sudden noticed that music such as calm 1 and songs such as creative 1 would (very rarely) play at the same time. I believe having internet and minecraft running at the same time contributes to multiple songs playing at once.

What I expected to happen:
I obviously expected only 1 song to be playing instead of multiple (in my case 2)

Steps to reproduce:
I've tried a few things (which none worked to reproduce this), and I've done some observations and conclude that having minecraft and internet explorer running at the same time had a better chance of having two songs merge in the normal minecraft game then all of the other things I have tried to do to reproduce this issue.

PLEASE READ BEFORE CLOSING OR COMMENTING!
Remember this will not appear all the time! This might not happen to other people if it does please say so below!

Thanks, Kyle Bartush
PS PLEASE don't mark my issue as invalid or cannot reproduce until it has been attempted to reproduce. On my previous report (MC-76072), it was marked as invalid and I really don't understand why.