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).
Klavierstück XII and Klavierstück XIII (and their versions as scenes from the operas Donnerstag aus Licht and Samstag aus Licht) were written for his daughter Majella, and were first performed by her at the ages of 16 and 20, respectively. The saxophone duet in the second act of Donnerstag aus Licht, and a number of synthesizer parts in the Licht operas, including Klavierstück XV ("Synthi-Fou") from Dienstag, were composed for his son Simon, who also assisted his father in the production of the electronic music from Freitag aus Licht.