(b Wokingham, 1931).
Eng. musicologist. Lect. in mus. at Birmingham Univ., 1957–62, and King's Coll., London, 1964–5. Dir. of operas, GSMD 1963–7. Head of radio opera, BBC, 1967–70. Returned to King's Coll. 1970 as reader, becoming prof. 1974. Prof. of mus. Oxford Univ. 1988–96. Authority on 15th‐cent. Eng. mus. and on opera of all periods.