Idyllwild Arts Academy.
www.idyllwildarts.com
I am a third year junior here doing a double major in Classical and Jazz. It is the best school going for small combo's and chamber orchestras. You could check out interlochen, which has a bigger name, but this school is young enough not to have the cocky bastards, but old enough to turn heads when you apply to college. PM me if you want more info. Idyllwild is pretty near LA, which is also another plus.