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The sixth text, Intervall, was written more than a year later, on 22 September 1969, at the Couvent d'Alziprato in Corsica, for Henry-Louis de La Grange and Maurice Fleuret.

The seventh, eighth, and ninth texts were written in February 1970, during a three-week stopover Stockhausen made in Bali, on his way to Japan for Expo '70 in Osaka.

[1] A little over two years later Gentle Fire also gave the first performance of Spektren at the Shiraz Arts Festival on 4 September 1972, in the context of a series of concerts featuring Stockhausen's music.

[1] The piano duo Intervall was premiered in London by Roger Woodward and Jerzy Romaniuk on 5 May 1972, and Ceylon was first performed by the Stockhausen Group at the Metz Festival on 22 November 1973.

[4] Intervall, for example, is scored for piano duo, four-hands, and is quite explicit about the course the music is to follow, while Japan includes a written-out melodic formula and Ceylon specifies a rhythmic pattern for the Kandy drum (Geta Bera).