as stated in earlier posts, leaving alone the difficulty in composing mind blowing music for scenes like the concert depicted here, too many legal obstacles to ever see this animated- estates of cobain, joplin, james brown to deal with and particularly prince and jimi hendrix's estates are famously guarded and litigious. unfortunately it can't even approach wishful thinking- it's as close to impossible as can be. playing their songs while reading will have to do.
in the meantime, trumpet cover of "love is over"-
https://www.youtube.com/watch?v=Nr_qRo-yQSM