The Chandravina, instrument invented in the sixties : 2 strings version about 2 meters long – it could remind a kind of slide guitar except that strings are plucked on the leftover segment of the string, between the sillet and the bottleneck. The longer part of the string vibrates then in resonance with its smaller section, only on points presenting harmonic proportions. One position, on each string, generates then at least two fondamentals plus their harmonics. The art of chandravina consists to slide from one vibratory state to different others and keeping in harmony.