Ondes Martinot

The world's first synth.

Check out the star trek theme at the end of the clip!

http://www.youtube.com/watch?v=Yy9UBjrUjwo

I love the Ondes Martenot, of course. And Jean Laurendeau is one of the best connoisseur of the instrument. He made a great book about the inventor.
A beautiful intrument, heard in the Turangalila of course by Messiaen, but also Radiohead, Yann Tiersen, Jacques Brel, and many contemporary composers used it.

The french version of the russian theremin.