Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Giacinto Scelsi, Count of Ayala Valva (La Spezia, January 8, 1905 – Rome, August 9, 1988) was an Italian composer who also wrote surrealist poetry in French. He is best known for writing music based around only one pitch, altered in all manners through microtonal oscillations, harmonic allusions, and changes in timbre and dynamics, as paradigmatically exemplified in his revolutionary Quattro Pezzi su una nota sola ["Four Pieces on a single note"] (1959).

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