Seay, Albert. Music in the medieval world / Albert Seay. - 2nd ed. - Englewood Cliffs : Prentice-Hall, 1975. - ix, 182 p. : ill. ; 23 cm. - Prentice-Hall history of music series . Open access. ISBN: 0136081339 LCCN: 7423185 Subjects--Topical Terms: Music--500-1400--History and criticism.