Not only for relaxation, also for our meditation practice, music can play an important role. Along with lighting a candle, burning incense and having fresh flowers in the space of our meditation, beautiful music composed for meditation can be a great way to transition into a meditative mode. Surely, you feel refreshed and rejuvenated after only 15 minutes of this treatment.
I have come across come sources for accessing meditation music. www.soundstrue.com is one really good source. Also take a look at Deepak Chopra's website for music. And also www.thedailyom.com is a good source.
These are some hints besides amazon.com.
Plus, you can get Cristof's meditation music CD coming soon!