FOR AID in preparing the present resume of Spanish music to 1530 I am indebted to so numerous a company of friends that I must content myself in this preface with no more than a token alphabetical list. In an earlier article - "Music Research in Spanish Libraries," published in Notes of the Music Library Association, sec. ser. X, i (December, 1952, pp. 49-57) - Richard Hill did kindly allow me to itemize my indebtednesses to the Spanish friends whose names make up two-thirds of the following list. The reader who has seen that article already knows how keenly felt are my gracias. Fernando Aguilar Escrich, Norberto Almandoz, H.K. Andrews, Higinio Angles, Jesus Bal y Gay, Robert D. Barton, Gilbert Chase, R. Thurston Dart, Exmos. Sres. Duques de Medinaceli, Charles Warren Fox, Nicold, s Garcia,]ulidn Garcia Blanco, Juan Miguel Garcia Perez, Santiaga Gonzdlez Alvarez, Francisco Guerrero, Perreal Herndndez, Ma cario Santiaga Kastner, Adele Kibre, Edmund King, Luisa de Larramendi, Pedro Longds Bartibds, M arques de Santo Domingo, M arques de Villa-Alcdzar, J uan M ontejano Chico, B. Municio Crist6bal, Ricardo Nuiiez, Clara L. Penney, Carmen Perez-Ddvila, Gustave Reese, Francisco Ribera Recio, Bernard Rose, Samuel Rubio, Adolfo Salazar, Francisco Sdnchez, Graciela Sdnchez Cerro, Manuel Sdnchez Mora, Alfredo Sixto Planas, Denis Stevens, fase Subird, Earl 0. Titus,]. B. Trend,]ahn Ward, Ruth Watanabe,]. A. Westrup, Franktin Zimmerman