Based on the track record of previous shows (all the musicals have been Jukebox shows and/or movies with movie adaptations)
I would say likely choices include Tina, Beautiful Noise: The Neil Diamond (although this is still on Broadway, so less likely), Escape to Margaritaville the Jimmy Buffet musical, The Cher Show, &Juliet (same situation as Beautiful Noise), Beautiful the Carol King musical, and Motown the Musical.