Note 8 — OSCAR BIE
E. E. (Ernest Edward) Kellett translation
Doubtless the author refers to the tendency in the sixteenth century for voice parts to be made interchangeable with instrumental parts. Many instances might be given both in Italy and England, e.g. if a tenor voice were absent, the part was played by a tenor instrument, viol, cornetto, trombone, or what not. This was the more easily made habitual since instrumental accompaniment merely consisted in doubling the vocal parts.