"New transcriptions [by Blackley] from ... the ... Antiphonale Missarum, Laon, MS 239." Durations: 17 min., 48 sec.; 19 min., 7 sec. Program notes by Blackley on container and ( p.) inserted; Latin texts with English translations on container. Mass for Christmas Day.--Mass for Easter Sunday. Schola Antiqua; R. John Blackley, director. Recorded Jan. 3-5, 1978, Chapel of the Good Shepherd, General Theological Seminary, New York.