It is interesting about music in class. When I first started, back in the late 70’s I don’t recall music being used. Of course back then, I practiced to Lilias Folan on PBS.
I’ve taught class both using music and in silence. Each has a benefit as some of the previous posters have discussed. Yes it calms the agitated and over stressed student, but can also further distract if not chosen carefully. I’ve gone to class where the teacher has the music blaring and I couldn’t hear a word they were saying. I’ve been to class where there was no music and at times it was great, and other times I wondered why they didn’t play something.
For me, I take my cue from the energy of my students upon entering the studio.
But I must share one very funny story. I love hard rock music and have quite an extensive playlist of both rock and yoga music on my IPod. My students were coming out of a wonderful meditation and I went to cue my music. Out blared, and I mean blared, Alice In Chains! Luckily my students know of my love of rock and started to laugh hysterically. Ended up being a great class!