Compact disc.
Program notes by W.A. Chislett inserted in container.
[Analog recording] --ADD.
Recorded 22 May 1970 (op. 35) ; 6 August 1969 (op. 54, and op. 56, no. 3) at the no. 1 Studio Abbey Road, London; and 9-10 August 1957 (op. 64) at the Free Trade Hall, Manchester.