This reference work serves as a comprehensive, accessible guide to the terminology, history, and figures central to the study of music and opera. Percy A. Scholes, a noted musicologist and educator, compiled this volume to provide clear, concise definitions and historical context for students and enthusiasts. The text functions as a foundational reference, organizing complex musical concepts and biographical data into an alphabetical format for efficient retrieval. It aims to bridge the gap between technical music theory and general historical knowledge.

Experts frequently cite this work as a reliable, standard reference for students and general readers seeking quick, accurate information. Readers often note the clarity of the prose, which avoids excessive jargon while maintaining academic rigor.