Created and built by Henry Lim, with the exception of the wire strings, the LEGO Harpsichord is entirely constructed out of LEGO parts – the keyboard, jacks, jack rack, jack rail, plectra, soundboard, bridge, hitch pins, tuning pins, wrestplank, nut, case, legs, lid, lid stick, and music stand are all built out of interlocking LEGO plastic bricks and related pieces. With a 61 note range, the instruments size is 6 x 3 ft. weighing approximately 150 lbs, and built with an estimated 100,000 LEGO pieces!
Here is an audio sample.