The publisher John Calder began the Opera Guides series under the editorship of the late Nicholas John in association with English National Opera in 1980. It ran until 1994 and eventually included forty-eight titles, covering fifty-eight operas. The books in the series were intended to be companions to the works that make up the core of the operatic repertory. They contain articles, illustrations, musical examples and a complete libretto and singing translation of each opera in the series, as well as bibliographies and discographies. You can now purchase The Complete Calder Opera Guides Collection (48 volumes) at half price.