Sonata Plastica

With the exception of the wire strings, this instrument 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 ABS (Acrylonitrile-Butadiene-Styrene) plastic bricks and related pieces.

And is playable. (mp3)

Specifications include a 1 x 8' disposition (single choir (one string per note), middle C corresponds to middle C on other instruments), single manual (one keyboard), 61 note range (5 octaves, C-c'''', A415), 6 x 3 ft. dimension, approximate 150 lbs. weight, and an estimated 100,000 LEGO piece count.

via monochrom