One big market for music today that is not well supported by BIAB is the Movie/tv/indie film industry. The industry's music tends to rely on cliches, so real tracks that provide variations on all the cinematic cliches would be really useful to film makers and wannabes like me.

Real Tracks to support the following would be amazingly useful:

chase scenes
romantic scenes
pratfalls
suspense
humor
scary
drama
background
inspirational

etc etc .. you get the point.