Graduale Triplex Gregorian Chant

Introïtus Adorate Deum
Tempus per annum, hebdomada tertia
from
Graduale Triplex, Solesmes 1979, p. 264
Einsiedeln (Switzerland), Stiftsbibliothek 121

http://www.youtube.com/watch?v=JQQXHUu1FPI