Three Libraries in Aberdeen possess substantial collections of early music - the University Library, the library of the University Music Department, and the City Public Library. None, however, has a separate catalogue for its early music, and it has been virtually impossible hitherto to ascertain what each library contains. Thus these collections have remained largely unused and unusable, and have never been thoroughly examined. The aims of the present union catalogue covering the three libraries are accordingly to indicate what is available in each, to enable the collections to be more widely used and to stimulate interest in them generally. As in similar publications, particularly that of Schnapper (1957) and various volumes of RISM, the terminal date has been fixed at 1800. However, a few items which may be of slightly later date are included with the conjectural date ‘c. 1800’, and items which clearly seem to be of a later date but which are listed by Schnapper with an earlier date are also listed here.