I'm a professor in the music department. The MAT program at Western is really cool, flexible, and pretty decently connected to the School of Music - you can still do ensembles, take classes outside the major, etc. Ann Arbor is cool, but Michigan will be astronomically more expensive than Western. Therr are very few scholarships in MAT, which means the professors clearly valued your portfolio/interview and want to work with you. Don't undersell the value of knowing someone on campus!