The Musical Acoustics Research Library (MARL) is a collection of independent archives or libraries in the field of musical acoustics research. This website provides an extensive collection of files compiled by distinguished groups or individuals in this area of research. The library is made up of the Catgut Acoustical Society Library, the Arthur H. Benade Archive, the John Backus Archive and the John W. Coltman Archive. Most of the library content is hard copy but can be viewed on request. Links are also provided to other musical acoustics groups and resources.