This reference work in four volumes covers all forms of popular music from 1900 to 1992, listing every artiste, band, genre, group and musical style in an A-Z format, beginning with ABBA and ending with ZZ Top. The four volume set - compiled with contributuions from more than 40 writers and musicologists - contains approximately 10,000 entries, varying in size from 150 to 3,000 words.