Choralis Constantinus (Heinrich Isaac)
Heinrich Isaac's Choralis Constantinus was commissioned for the cathedral of Constance in 1508 and published posthumously in three books 1550-1555. Volume I opens with Asperges me and a Gloria Patri, followed by propers of the de tempore Sundays. Volume 2 covers the major feasts employing sequences, mostly from the sanctoral cycle.
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