This new online-only edition of The Oxford Companion to Music is a partial revision that focuses on living composers and their music, and adds some terms, works, and cross-references to the original text. Bibliographies have also been substantially revised and updated. This classic reference work includes articles that range from clear, concise definitions of musical ideas and terms to extended surveys of musical forms and styles, with specialist coverage of virtually every musical subject. It places music in its social and cultural context, with a range of new entries on topics such as politics, religion, psychology, and computers. The book covers current research in and approaches to music, including analysis, theory, ethnomusicology, and performance practice. All varieties of musical forms are covered, including jazz, popular music, and dance.