My favorite CD for DS is called Music for Dreaming, recorded specifically for babies by the Melbourne Symphony Orchestra. According to the CD cover, it has been shown in clinical trials to soothe irritable bubs and they use it in maternity hospitals. They have also composed one for mothers too - it is just so calming that I am taking it to the birth centre with me for my 2nd labour!! I think you can buy them together as a set.
This CD has its own website if your interested in checking it out.

X
ahh thats the one i couldnt remember name off!!