Of the Keyes which are to be marked.
OF Keyes some are to be marked, or (as others call them) marked Keyes, others are called vnmarked Keyes. Of the marked, there are fiue prin∣cipall, viz. Γ vt, F faut, C solfaut, G solreut, and Dd la sol: which the Am∣brosians (as Franch. lib. 1. pract. cap. 3. reports) did mark with colours. F faut, with red, C solfaut with blew, double bb with skie-colour. But the Grego∣rians (whom the Church of Rome doth imitate) marking all the lines with one colour, to describe each of the marked Keyes by his first Letter, or some other signe, as in the Scale was mentioned.
Those Keyes which are lesse principall, are two, b round, and ♮ square: The firstshews that the Voyce is to be sung fa, the second that it is to be sung mi in the place wherein it is found. And vnlesse one doe heedily discerne b from ♮, he doth confound the Song (as Berno sayth) euen as wine and wa∣ter being mingled together, one can discerne neither.