Are you a saxophonist, pianist, trumpeter or a skilled musician falling in a non-rock category? Then consider yourself summoned. The Foo Fighters want to create the first ever user-generated orchestra at their next performance of The Pretender at the Grammy Awards, and they’re using Youtube and MySpace to do so. Actually, it’s one of the few instances where those two platforms work together. The post on the Youtube blog doesn’t link to MySpace though, so don’t get any funny ideas.