Originating in 1969 with a short melodic fragment that grew into an elaborate piece that runs well over an hour, Karlheinz Stockhausen's Mantra for two pianos and electronics is recognized as one of his major keyboard works and an example of his increasingly liberal use of serial methods. The central idea operates on many levels throughout the composition, and the organization of Stockhausen's 13-pitch series a twelve-tone row with the first note repeated at the end takes place on small and large scales, with some permutations of the motive or "mantra" extending over so much time that their relationships become imperceptible.
This is [the stereo version of] the 8-channel tape of electronic music in TUESDAY from LIGHT, and plays through the entire second act, INVASION – EXPLOSION with FAREWELL (about 74 min.), including a stereo bridge in PIETA. The stereo bridge is omitted when OKTOPHONIE is performed as such, and the duration of the work then is about 69 min. (as it is also presented on the CD).