Vibraphone, Cowbell – Christoph Caskel (tracks: B2)
Wood Block – Aloys Kontarsky (tracks: B2)
Front cover illustration: - Les Multiples: Demarco "Reflexion mobile" - Soto "Boîte Vibration" - Vasarely "Relief Polychrome". - Photo: Conaissabce des Arts (Peter Willi).
Back cover info: - Recorded with Dolby S/N Stretcher. - Stereo may also be played Mono. - "Program notes by Stockhausen enclosed". - Printed in U.S.A.
Includes an 8 1/2" x 11", two-sided textured insert in English and German with program notes. Insert info: - "Refrain" recording was made on July 11, 1968. in the Südwest Tonstudio Jansen, Liederkranzhalle, Stuttgart-Betnang, Lortzingstasse.. - "Kontakte" recording was made on the 7th and 8th of July, 1968. in the Cologne Radio (WDR - Westdeutscher Rundfunk). - Printed in U.S.A.
Center-labels info: - Made in U.S.A. - Recorded with Dolby S/N Stretcher. - Universal use - Stereo can also be played Mono.