I just received my certification and music is such an important piece I think to a successful class. And that include playing things maybe you as an instructor does not like, because your class does. And creativity is so important -- I have had instructors that just bring in a CD and play it...incredibly boring and the class does not flow.

So, tell your instructors you want them to put more thought into their music! It's part of good visualization and a good class.

If you are interested, www.spinning.com also has forums, and there are music forums for instructors with good ideas, etc.