Harmonix clarifies the '5000 Rock Band songs' rumor

That said, one of the great promises of the catalog moving forward, as the catalog expands from 500 songs to 5,000 songs or whatever in the coming years, is that we're going to be less constrained from a genre standpoint, and I think you will see us starting to branch out into... whether it's country or R&B and jazz or funk, or things of that sort. With the critical mass of the "rock" core covered, of course we'll keep expanding it, but the critical mass is covered, so now we can start to branch off in ways that haven't made sense in the past but will make sense moving forward.