I use Dave Matthews Band to audition. Those are some well-mixed albums. Your m22's will be shining in all their glory with his music. Just about any track will do, but I like to start with "Satellite" as it reveals some crisp acoustic plucking and then gradually adds in other textures and colors. The song "Oh" off of his solo album is also really good for this. Queen's "Bicycle" is good for another style of rock. I use Beatles as well, since they were known to be so meticulous in their mixing. The studio mix was an art in and of itself for those guys. Check out "A Day in the Life" and of course, "Eleanor Rigby."
