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Meaning of Guido d'Arezzo

Gui•do d'A•rez•zo

Pronunciation: (gwē'dô dä-ret'tsô), [key]
— (Guido Aretinus) (“Fra Guittone”),
  1. c995–1049?, Italian monk and music theorist: reformer of musical notation.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.