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Harrison Birtwistle's Operas and Music Theatre by David Beard. Cambridge University Press, £70.00.

Variations II ‘reveal a poietic space, within which truthful forms of praxis can in turn be revealed’ (p. 215). Cage required Tudor’s praxis to birth his compositions, and this lies at the heart of the book. Iddon provides an extended bibliography and index. In presenting the complete extant correspondence between these two vitally significant artists, this publication’s value is indisputable, while Iddon’s writing hugely extends its appeal.