Lucien GUÉRINEL (born 1930). Autograph musical manuscript, Twelve Micro-Studies for piano, [1984-1990]; 14 sheets 32.5 x 24.5 cm. These brief Micro-Studies are pedagogical works; the whole set lasts 9 minutes 30. 1 " Croisement difficile. Rhythmic mastery", Con moto; 2 "Sense of phrasing. Delicacy of touch. Harmonic reflexes. Extensions "; 3 " Sense of phrasing in superimposed voices "; 4 " Rhythmic firmness. Independence of the hands. Extensions"; 5 "Independence of the hands. Regularity and equality of staccato. Nuances"; 6 "Same objectives as the previous one"; 7 "Objectives similar to the two previous studies. Maintaining tempo according to the speed adopted"; 8 "Opposite large gaps, control of space. Sense of humour"; 9 "Rhythmic control. Independence of the hands. Crossings. Control of intensities "; 10 " Phrasing and expression "; 11 " Large non-arpeggiated chords. Sense of voice"; 12 "Sparkling, mobility, sense of brilliance, suppleness of gesture", Quasi improvisando. The manuscript is carefully written down in Indian ink on tracing paper on systems of two staves (three for the last one), with the titles on typewritten stickers. B1