MODE (Lat. Modus; Ital. Modo; Old Eng. Moode). A term employed in mediæval music, to indicate the relative duration of the Large, the Long, and the Breve.
Mode is of two kinds—the Greater, and the Lesser. The former regulates the proportions of the Large (maxima) to the Long: the latter, that of the Long to the Breve. Both kinds maybe either Perfect, or Imperfect.
In the Great Mode Perfect, the Large is equal to three Longs. In the Great Mode Imperfect,...