Crossword clue: the gamut, or musical scale. see tonic sol-fa, under tonic, n.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
To sing the notes of the gamut, ascending or descending; as, do or ut, re, mi, fa, sol, la, si, do, or the same in rever