This reference work investigates the comprehensive history, technological evolution, and cultural impact of recorded sound from the late 19th century to the modern era. Frank Hoffmann, a noted scholar in music librarianship, compiles an extensive array of entries detailing the inventors, companies, formats, and musical genres that defined the industry. The text serves as a foundational framework for understanding how mechanical and digital reproduction changed the consumption of music globally.

Experts and music historians frequently cite this encyclopedia as a primary resource for archival research and technical history. Readers often note the academic density of the prose, which provides a high level of detail suitable for professionals and serious students of musicology.