Prosocial preteen music?

I was really intrigued by what we learned about prosocial music, especially when we listened to the song "Soldier."  I've thought about how music impacts our lives whether we want it to or not, so it would probably be better for us to be proactive about finding good music that will affect us in the way we want it to.  With that in mind, I've been trying to come up with a prosocial playlist for a preteen boy who's had a difficult life.  I've found a few songs, but I'd like to find more.  Does anyone have any suggestions?