The "String Thing" ensemble has put together a rich collection of material in "Groovy Strings:" an introduction to basics and methods, exercises for rhythm and body percussion and, above all, 26 original pieces for all stringed instruments. The pieces can be flexibly combined in trio settings and duets, which makes the book ideal for ensemble and individual instruction. The enclosed CD sets new standards. It contains not only audio recordings of all pieces which can also be used as play-alongs, but also video sequences illustrating special techniques. There are also individual performing scores which allow the string player to react to varying circumstances in actual practice, as with the "Flexible Strings" (KM 2292).