The focus of the pieces by Alvin Lucier on this CD is on the phenomena of resonance - sympathetic vibration - in many variations. "Time and again I find myself having to pare away any musical gestures in a work in order to uncover the true idea in a piece," says Alvin Lucier. The composer knows which ideas he wants to liberate. But the process of causing the environment to resound is always a collaborative, interactive project. It needs someone who is creatively engaged, even obsessed, to make Lucier's music of ideas a music of the ears. Someone of precisely the type found in this production - Matthias Kaul.