Early Medieval Music up to Thirteen Hundred

xviii, 434 p. : ill., map, facsims., music ; 26 cm. ; Contents: Early Christian music ; Music of the Eastern churches / Egon Wellesz -- Russian chant / Alfred J. Swan -- Latin chant before St. Gregory / Monsignore Higini Angles -- Gregorian chant / Higini Angles -- Trope, sequence, and conductus / Jacques Handschin -- Liturgical drama / W.L. Smoldon -- Medieval song / J.A. Westrup -- The birth of polyphony ; Music in the twelfth century ; Music in fixed rhythm ; The motet and allied forms / Anselm Hughes.