http://www.youtube.com/watch?v=zg9Ic4Pu-KA
Despite the sound quality, this video is absolutely awesome. This piece really shows how ahead of his time he was with his use of electronic timbres. The first part sounds almost Tangerine Dream-like, the second like something written for a goofy / creepy setting in a video game....
Does anyone know of any other compositions written for Ondes Martenot in groups with no other instruments, like this? I can recommend everyone to look into the works of Oskar Sala, which uses the somewhat similar but very peculiar Trautonium, and is also very fresh sounding still today.