Salmon, Thomas. An Essay to the Advancement of Musick, by casting away the Perplexity of Different Clefs, and Uniting all sorts of Musick in one Universal Character. London. J. Macock. 1672. 1st. 1672. 1. notation | theory | history. A theory for reforming the Gamut and doing away with clefs. Fold-out engraved exx.: lute, viol, vln., org.,harpsichord, voices, strings. Grove 16 p. 427 | RISM BVI2 p. 749. Musical Writings 629. 811.