The same music being shared by so many different programs just opens a whole another can of worms.
Seeing it's unlikely there's even gonna be a GI Joe soundtrack, does that mean all this "shared" music just winds up on the Transformers one? It'd basically mean people who want the music from those other shows would have to buy it, but they'd still be left without the music exclusive to the other shows.
I think, at least for the early series, it's probably just the theme music (start and end credits) that aren't shared...
It would make more sense to just do some kind of collected '80s cartoon music compilation for these.