[ gwee-daw dah-ret-tsaw ]
/ ˈgwi dɔ dɑˈrɛt tsɔ /
Guido AretinusFra Guittone, c995–1049?, Italian monk and music theorist: reformer of musical notation.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
/ (Italian ˈɡwiːdo daˈrettso) /
?995–?1050 ad, Italian Benedictine monk and musical theorist: reputed inventor of solmization
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012