Una Voce Westchester is pleased to announce a two-part lecture on Gregorian chant by David Hughes this Sunday, Jan. 21st, and the following, Jan. 28th, at Immaculate Conception Church in Sleepy Hollow, New York.  Both talks are at 2:15 p.m. and will be followed by the celebration of the Latin (Tridentine) Mass at 3:00 p.m.  Session I: Proper Context and the Context of Propers: Chant in the Latin Mass.  Session II: Singing Chant at Mass.  Illustrations for the talks and chants at Mass will be sung by the Sleepy Hollow Schola Cantorum.  More information is available by calling 914-277-3368, or by visiting www.unavocewestchester.org.