Sometimes the best interface for music is no interface at all. The international S.S.S. trio
(Sensors Sonics Sights) has adopted three different gestural interfaces
for their work: ultrasound, traditional Theremin, and EMG electrical
'bio-signals' that measure muscle contractions. None of these are
unique in themselves, but seeing the visual artist, Theremin virtuoso,
and electronic music inventor making arm motions together onstage is

It's incredible to consider: the Theremin was invented in 1919, but in
2004, with all the technology we have, there's still novelty to someone
magically waving their arms and producing sound. (First seen on networked_performance)