There are a lot of music-themed graphic novels, but most aren't teen oriented. Only one I can think of off the top of my head is called Amazing Joy Buzzards. There's a trade paperback available from image Comics. It's a comedy book, and involves a rock band that travels around and fights supernatural baddies, so it's not entirely music oriented, but pretty hip and funny. I'd second Wendell's recommendation of Red Rocket 7, which also seems to be available in trade form through Dark Horse.
Sports? I'm drawing a complete blank.
If I think of something, or can think of other music-related GNs I'll certainly be back.