Board Thread:General Discussion/@comment-75.88.223.7-20170617051005/@comment-4010415-20170617093906

It is entirely possible that they were originally going to wait to do a Bumblebee song until later. Boop is on the volume 2 soundtrack, and when the volume 2 soundtrack came out, we had Nora awkwardly trying to gauge Ren's reaction to the idea of being "together-together" in volume 1, as well as Jaune assuming Nora and Ren were together-together in volume 2.

We haven't had much in the way of Bumblebee at all, so they could've been waiting to make a Bumblebee song until there had been a bit more of a hint to it in the show itself. But Jeff wanted to add a song as an apology, so he chose to write one.