Another great thing about the Varèse 360° gigs was the performance of Ecuatorial with two Theremin cellos in the ensemble. Ecuatorial is the only piece specifically written for this incredibly cool instrument, and up until a few years ago it could only be performed with a pair of ondes Martenots substituting, as the only two existing Theremin cellos are now in museums.
The story of the reverse-engineered and newly rebuilt Theremin cello, and its role in Ecuatorial, can be found here. Some more info and a better photo of the new instrument here.
