Board Thread:General Discussion/@comment-30450220-20170626021526/@comment-4010415-20170828003746

There is the fact that Jeff knows about things in the show that we don't know about. MMK told him about future plans and characters' pasts so that he could use that information to write accurate songs. If Yang has feelings for Blake and that is going to be revealed later, Jeff may know about it, and if that's the case, then Bmblb could've been him jumping the gun on the song.

It wouldn't be the first time we've gotten a song before the thing it talks about is revealed or addressed. Just look at From Shadows and Red Like Roses Part 2.