WordNet
Wikipedia
A music director may be the director of an orchestra or concert band, the director of music for a film, the director of music at a radio station, the head of the music department in a school, the coordinator of the musical ensembles in a university, college, or institution (but not usually the head of the academic music department), the head bandmaster of a military band, the head organist and choirmaster of a church, or an Organist and Master of the Choristers (a title given to a Director of Music at a cathedral, particularly in England).
Usage examples of "music director".
Then there was Big Mike, their soundman/music director, who could hear what nobody else could, and could also blow the mothers up, literally.
Chloe's visitor motioned from behind Jock like a music director, and Chloe began to hum.
I was like a combination accountant, librarian and music director.
I need to introduce Dietrich Morse, the new music director at our parish.
For Schliemann was the name of his old music director, who was dead.