Although not for every opera lover (or every opera lover's budget), this massive four-volume set--each volume coming in at around 1,300 pages--is indispensable for the opera educator, writer, or major fanatic. While in any encyclopedia the quality of writing and the critical viewpoint must of necessity be somewhat varied, the standards in the Grove series of reference works are always high and the level of usefulness enormous. Almost any opera that debuted before 1992 is to be found within these pages, making it especially useful in this age of obscure revivals; most singers of any note who had established careers before that date are also included. Although somewhat Anglocentric in its inclusions, this remains an invaluable reference work.
Stanley John Sadie CBE was an influential and prolific English musicologist, former music critic for The Times of London and editor of The Musical Times, published thirty books and edited the monumental New Grove Dictionary of Music and Musicians.