The gopichand, also known as gopiyantra or ek-tara, is a popular folk instrument of Bengal, India.  It is an intrument that is much used by the Baul, wandering mistrels...It's a one-string musical instrument with a drum at the bottom.  String is plucked and bamboo sides are squeezed to bend the note...It can be tuned with the peg at the top...Can be restrung with a guitar high E string...Comes in two sizes.