Meaning of the title: the inflexible laws of Necessity. This piece was composed and played as a tribute to Blaise Pascal who, with Pierre de Fermat, was one of the founders of probability calculation. The work used the same stochastic programme as H ST/10 1.080262 and was calculated by the IBM 7090 computer at Place Vendôme, although a few liberties were taken. The programme using
the Fortran language is the one in Gravesaner Blätter n° 26 Gravesano, Tessin, Switzerland – used again in Musiques Formelles, Richard-Massé 1963 and Editions Stock 1981, Paris. The ensemble consists of a flute, a B flat clarinet, a bass clarinet, a horn, a C trumpet, a tenor trombone, three percussionists playing maracas, cymbal, gong, temple blocks, tom-toms and vibraphone, a violin and a cello.
