"We want your full Commitments to celebrating the best fictional bands, rappers, singers and musicians on the big screen. List up to ten favorite filmic fantasy bands, whether the whole movie is about them, or they just have a weekly gig at the Mos Eisley Cantina."

I was a bit unclear on the challenge: is it just fictional bands or any kind of musicians? Well, I wouldn't know ten movies with bands so I'm going with musicians in general.