Mark Morris is known as a particularly musical choreographer. And he has some Particularly strong opinions about musicians. At Tanglewood this summer he has musicians up dancing. “This experience makes musicians better. Way better! The thing is, I’m the enemy of the conservatory, because it kills music. Nobody gives a damn about intonation. It’s not about that. Imagination has been wrung out of these people, and it’s tragic. Really, musicians have lousy rhythm.”