Ability to add songs for local play

With all the requests for specific songs and genres, why not allow players have the ability to add up to a handful of custom songs of their choosing?

Game could randomly generate a game for each song. This has been done before with a DDR knock off game where it'll analyze your song for BPM (beats per minute) and then make a game synced to that.

Would like to see the ability to create your own game to the song of your choosing, but I think having it generate it automatically would be better overall.