Compact discs.
Program notes in English translation (19 p. : ports.) inserted in container.
Recorded live Oct. 4, 1953, Concertgebouw Amsterdam (1st work), Oct. 10, 1957 (2nd work), Nov. 15, 1948 (3rd work), Sept. 29, 1955 (4th work), June 13, 1957 (5th work), and Nov. 4, 1954 (6th work), Copenhagen.