https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse English German 1. Kyrie des Ordinariums "Orbis factor" (11. Messe)
http://en.wikipedia.org/wiki/Image:Gregorian_chant.gif Missa XI Orbis factor (in dominicis infra annum), beginning of Kyrie eleison version B XIV-XVI. century