Lucien GUÉRINEL (born 1930). Autograph music manuscript, Diagramme for 12 strings and harpsichord, 1978-1979; 16 sheets, 35 x 27 cm. Diagramme was premiered in 1980 at the Festival de Saint-Maximin by the Ensemble instrumental de Provence and Michel Zaffini on harpsichord, conducted by Clément Zaffini. The work begins Lent, soutenu. The manuscript is carefully written in Indian ink on tracing paper with, generally, 2 systems of 14 lines per page. It is dated at the end "June '78-June '79". The manuscript (copyist) of the harpsichord part in violet ink on tracing paper (9 ff. 30.5 x 23 cm), with a variant cadenza that will be corrected in the orchestral score, is attached; plus autograph material on tracing paper.