CD recommendations please

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I have to trick my 2-yr-old into going to sleep if I don't want a major fight on my hands. When I was younger my parents had a tape that was a space adventure and then calmed down into sleeping mode that they used to play for me. I was wondering if anyone out there knew of something like this available on CD or perhaps a CD that started out with a fast tempo and slowly got slower and more "tired" over the course of the CD. Thanks.