ABSTRAKDespite adequate documentation of monograph arrearages in academic libraries, backlogs of music materials for the entire library community have gone unreported. In confirming the existence of music backlogs, it also becomes necessary to address questions concerning how the grew, what causes these backlogs to continue, and what it might take to eliminate them. In a survey of institutional subscribers to the Music Cataloging Bulletin, libraries were asked to quantify their uncataloged scores and sound recordings and to describe their music cataloging staff and procedures. Of the 358 participating libraries, 77% reported having music backlogs. These backlogs grew primarily as a result of large acquisitions and gifts without corresponding staffing staff to process them. Respondents also cited lack of knowledgeable staff as a deterrent to the reduction and elimination of the backlog.