KaliMa, go ahead, please. Yes, it's very helpful but should be calming rather than upbeat or jazzy. I might suggest New Age music seems to work well. Stick with a program. It takes work.
Nothing can replace a good yoga instructor.
Tapes and books are wonderful tool for regular practice or when a teacher is not available. More subdued lighting creates a peaceful atmosphere. Glad you asked that. Yoga can almost always be used. The subtlest forms of yoga require breathing and the mind, so there really would not be a problem, but the form of yoga should be suited for the person and their problems.