Actually, I give the CD 4.5 stars. It's not a 5 because this music may not be for everyone. I don't say that to deter people, it's just that the music often strays far from the familiar.
It's very hard to classify the music on this CD. The closest comparison I can make is Meredith Monk--written for kids--but even then that description misses the mark. Even so, it's really worth listening to. I first borrowed it from the library because I was interested in a cappella voices, mainly children's voices. And the CD left quite an impression on me.
The pieces are by various Scandinavian composers, sung by the Tapiola Children's Choir. The music ranges from traditional songs (vintern var hard) to the very unusual (A: water music). There's a very haunting, dreamlike quality to the children's voices. They buzz, whisper, sing, and shriek, but always retain their pristine clarity. Sometimes the voices sing a solemn hymn; sometimes they chase each other playfully around the listener.
It's a very whimsical CD, but it's never harsh on the ears. It's not just about singing; it's about making the most out of the human voice as an instrument. A side note: it's been said that the songs are very demanding to perform because they're so abstract. Kudos to the Tapiola Choir for doing it wonderfully.