sol-fa

sol-fasol-fa: [16] Sol-fa is a lexicalization of two of the syllables (sol and fa) used in the tonic sol-fa system for representing the notes of the musical scale. In Italian the combination was turned into a verb, solfeggiare, a derivative of which has given English solfeggio ‘use of the sol-fa system’ [18]. (Another English word based on the name of notes of the scale is gamut.)sol-fa (n.)"syllables used in solmization taken collectively," 1540s, from Italian, from Medieval Latin sol and fa, two notes of the musical scale (see gamut). As a verb from 1560s; compare solfeggio "use the sol-fa system" (1774), from Italian solfeggiare.