When did Guido of Arezzo live?
Guido of Arezzo
While at Arezzo, he developed new techniques for teaching, such as staff notation and the use of the "ut–re–mi–fa–so–la" (do–re–mi–fa–so–la) mnemonic (solmization). The ut–re–mi-fa-so-la syllables are taken from the initial syllables of each of the first six half-lines of the first stanza of the hymn Ut queant laxis, whose text is attributed to the Italian monk and scholar Paulus Diaconus (though the musical line either shares a common ancestor with the earlier setting of Horace's "Ode to Phyllis" (Odes 4.11), recorded in the Montpellier manuscript H425, or may have been taken from it).[1] Giovanni Battista Doni is known for having changed the name of note "Ut" (C), renaming it "Do" (in the "Do Re Mi ..." sequence known as solfège).[2] A seventh note, "Si" (from the initials for "Sancte Iohannes," Latin for St. John the Baptist) was added shortly after to complete the diatonic scale.[3] In anglophone countries, "Si" was changed to "Ti" by Sarah Glover in the nineteenth century so that every syllable might begin with a different letter (this also freed up Si for later use as Sol-sharp). "Ti" is used in tonic sol-fa and in the song "Do-Re-Mi".