Guido d'Arezzo

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Gui·do d'A·rez·zo

 (gwē′dō dä-rĕt′sō) or Guido A·re·ti·no (är′ĕ-tē′nō) 990?-1050.
Benedictine monk and music theorist who devised the four-line staff, thereby allowing precise musical notation.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Guido d'Arezzo

(Italian ˈɡwiːdo daˈrettso)
n
(Biography) ?995–?1050 ad, Italian Benedictine monk and musical theorist: reputed inventor of solmization
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

Gui•do d'A•rez•zo

(ˈgwi doʊ dəˈrɛt soʊ)
n.
(Guido Aretinus) ( “Fra Guittone” ), c995–1049?, Italian monk and music theorist.
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