
Opus clavicembalisticum is a solo piano piece composed by Kaikhosru Shapurji Sorabji, completed on June 25, 1930. The piece is notable for its length and difficulty: at the time of its completion it was the longest piano piece in existence. Its duration is around four hours, depending on tempo. Several of Sorabji`s later works, such as the Sympho....
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http://en.wikipedia.org/wiki/Opus_clavicembalisticum

(from the article `Sorabji, Kaikhosru Shapurji`) Sorabji`s most famous composition is Opus Clavicembalisticum (1930). It consists of one movement lasting nearly 5 hours and is the longest ...
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http://www.britannica.com/eb/a-z/o/25
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