La Ma de Guido

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http://www.webcom.com/musics/guido.html

Title means "Guido's Hand." Guido was a medieval theorist, who supposedly used a diagram of the hand to teach students how to read music. You can see the diagram at this site, maintained by a publishing house that specializes in classical music and CDs by Spanish and Catalan artists. Biographies of the artists are included.