The catalogue consists of all known works accepted as Byrd’s, with an appendix containing dubious attributions. It is followed by “The Byrd Apocrypha,” which consists of all known spurious attributions. The catalogue provides references to the appearances of Byrd’s works in the complete or partial editions A–H and lists J–L. A lone letter indicates the presence of the item with no deviations of title or allotted section in one of the lists. Unnecessary duplication of any verbiage and numeration is avoided. The purpose of the catalogue and of its arrangement is twofold: first, to provide unification in respect of the inconsistent and unsatisfactory numerations among existing editions and lists; and, second, to provide published sources for all works associated with Byrd, especially when these sources have attempted to publish all of Byrd’s works or all of a section of his works, such as the keyboard music.