A friend of mine got us two CD's from Babytrax for my daughter's first birthday. She loves music and is full of energy, but when it's time to wind down we pop in the Babytrax CD's. We use it most when she's at her peak fussiness during car rides, and the music has an amazing calming effect. The pieces are so soothing, especially for baby, but also for mom and dad! I think what we liked most was that the music is "real". No tinker toys, sound effects, or anything else like that. The piano pieces are absolutely beautiful and our daughter actually responds to the music. We've gone back to the site and bought more. They have seven albums available on their site.
If you're a music lover like my husband and I are, or want to introduce your little one to music, I highly recommend giving Babytrax a listen.