I actually had my therapist record it for me, as she had such a gentle, soothing voice. She laughed at the idea that she was putting me to sleep at night, but for years, I used her tape. (There was some guided imagery at the end of the PMR.) Now I can put myself to sleep (or relaxed) just by going thru the motions.

Getting a soothing voice is really a good idea, as AniManiac mentioned. And a tape or CD of guided imagery to follow, is a nice way to keep the relaxation going for a longer time.