CHORALIS CONSTANTINUS

   Monumental collection of polyphonic propers for 99 masses for liturgical feasts throughout the year, composed almost entirely by Heinrich Isaac and completed by his student Ludwig Senfl for the court of Emperor Maximilian I (vols. 1, 3) and the Cathedral at Constance (vol. 2). Volume 1 was first published in Nuremburg in 1550 and volumes 2 and 3 in 1555.