I rarely wish a book had a sequel, but I think there's a lot of sequel potential here with Chelsea's story--she actually became a much more interesting character in the last few chapters. The music your stuff was pretty interesting, and since this was a really plot heavy (versus character driven) story, it was kind of the highlight for me. I also thought the best friendship was pretty interesting, though it seems like I'm in the minority on that. 
 I do think there's a rigid point of view relating what art is and what constitutes and artist (songwriters are > than performers in this narrative), which really bugs me.