This work investigates the publishing history and output of the John Walsh firm to establish a definitive record of 18th-century musical publications. The authors, Charles A. Humphries and William C. Smith, utilize archival research and physical examination of surviving scores to document the commercial activities of one of London's most prolific music publishers. The text provides a systematic framework for identifying, dating, and cataloging the vast array of musical works issued by the firm during its period of operation.

Experts and music historians regard this volume as a foundational reference for the study of 18th-century British music commerce. Scholars frequently cite the text for its meticulous attention to detail and its utility in dating otherwise obscure musical scores.