We have already tried so some sleep music to move our kids to fall asleep, whether instrumental relaxing music or sung children / lullaby. Our Little did gymnastics around in bed, and did everything to think except to sleep. But is different with this CD, he listens and takes really good to rest. Perhaps it is because that even Mama finds the music simply breathtaking ;-). The mix of sung and intrumentalen pieces in my opinion succeeded perfectly here. The voice is wonderfully pleasant and harmonizes very well with the Intrum ducks. Could almost a tick louder. All in all, a perfect sleep CD for us, shame that there is not anymore.