But here's a discussion, best musical performance by actors in a movie/best in movie band made up of actors.
The Bar Busters (Michael J Fox, Joan Jet, Michael McKeon, Thomas Waites)
I still have this on my phone in rotation. The movie was about a local cleveland band that was never going to strike it big. Joan Jet played Michael J Fox's troubled sister. It featured the song light of day written by Bruce Springsteen.
It also featured the awesome song "Rabbits got a gun"
Spinal Tap (Michael Mckeon, Christopher Guest, Harry Shearer,
Another act that's in my play list, While their first "album" was great, they were just musically better when they made the sequel.
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My name is Ozymandias, King of Kings;