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music a system of naming the notes of a scale by syllables instead of letters derived from the 11th-century hexachord system of Guido d'Arezzo, which assigns the names ut (or do ), re, mi, fa, sol, la, si (or ti ) to the degrees of the major scale of C ( fixed system ) or (excluding the syllables ut and si ) to the major scale in any key ( movable system ) See also tonic sol-fa