Ahmed ESSYAD (born 1938). Autograph musical manuscript, Prolégomènes (Mouqqadimah) for eight instrumentalists; 18 leaves (paginated 2-19) 35 x 27 cm. For an ensemble of eight soloists, the work was premiered in January 1970 at the Grands Concerts de la Sorbonne. Prolégomènes brings together: flute, English horn, percussion (suspended cymbal, small and large cymbals, snare drum, bass drum, toms, bendir), xylo-vibra, piano violin, viola, cello. It lasts about 10 minutes, and is in two parts. The manuscript is carefully written in Indian ink on 30-line tracing paper; it was used for the printing of the edition (Jobert, 1974).