This is the CD that I have heard more than any other in my whole life! We play it every night before little D goes to bed, and have done since he was 7 months old. About half the tracks are instrumental, half vocal but not in English, so it just kind of washes over you. Almost exactly 30 minutes in duration. I haven't come across anyone who doesn't like it, and I can still bear to listen to it after years of daily play!