Warrack, John and West, Ewan (1992), The Oxford Dictionary of Opera, 782 pages, ISBN 0-19-869164-5
Warrack, John (n.d.) "Gesamtkunstwerk" in The Oxford Companion to Music online, (subscription only) (consulted 15 September 2010)
He is the author of Carl Maria von Weber (Hamish Hamilton, 1968, 2nd ed. Cambridge UP, 1976), the standard study of Weber in English; German Opera: From the Beginnings to Wagner (2001) and the co-author of The Concise Oxford Dictionary of Opera (1964, with Harold Rosenthal) and The Oxford Dictionary of Opera (1992, with Ewan West).
Warrack, John and West, Ewan (1992), The Oxford Dictionary of Opera, 782 pages, ISBN 0-19-869164-5
Warrack, John and Ewan West, "Mitridate, re di Ponto", The Concise Oxford Dictionary of Opera.
Rosenthal, Harold and Warrack, John (1979) The Concise Oxford Dictionary of Opera, 2nd edition, Oxford University Press.
From 1945 to 1978 MacDonagh was professor of oboe at the Royal College of Music; his students included Edwin Roxburgh, John Warrack, Neil Black, Roy Carter and Anthony Camden.
The composer has said that the subject of the opera is "whether or not we can be reborn from the stereotypes we live in." John Warrack has noted that the work "confronts questions of stereotype on a wider scale" compared to Tippett's earlier operas, and also in a contemporary setting.
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