i rekon it really does work, and it doesnt even have to be soothing music! I listen to rock/hard rock and a couple of cd's that were my favourites during prenancy got played A LOT! Now when bub is unsettled or having trouble getting to sleep i put those cd's on and she either calms down to sleep or settles happily just sitting on my lap listening to it! I dont remember if she was more active or not in my belly when these particular cd's were on but it definately worked for me, i started using the ipod in her cot to get her to sleep (i would leave the room while her eyes were still open) when she was about 4 weeks old. Now she's 3 months old and loves Metallica and AC/DC!!