[MUSIC.] GREGORY, J. Library of Congress. Catalogue of early Books on Music (before 1800). Washington, 1913--BARTLETT, H. The Library of Congress. Catalogue of early Books on Music (before 1800) Supplement. Washington, 1944--MEYER-BAER, K. Liturgical Music Incunabula. A Descriptive Catalogue. London, 1962--KRUMMEL, D. English Music Printing 1553-1700. London, 1975--and 9 other pamphlets. Together, 13 volumes, various sizes, various bindings, condition varies. (13)