Léon DELAFOSSE (1874-1951). Autograph music manuscript signed, Études de concert, 1925-1928; title and 39 fol. pages, bound in ivory half vellum with corners, gilt title on upper cover. Collection of twelve concert studies for piano. Léon Delafosse was a renowned pianist, whose early career was encouraged by Robert de Montesquiou and Marcel Proust. Twelve etudes: I in C at 4/4, Slow (December 22, 1925); II in F at 2/4, Lively; III in E at 4/4, Slow; IV in E-flat major at 3/4, Moderate; V in D-flat major at 4/4, Lively; VI in G-flat major at 6/8, Moderate (July 23, 1927); VII in G minor at 4/4, Slow ; VIII in D flat major at 4/4, Moderate (October 8, 1928); IX in B flat major at 6/8, Lively (May 4, 1926); x in A flat major at 6/8, Lively (October 23, 1925); XI in E minor at 4/4, Moderate (May 4, 1926); XII in E flat major at 6/8, Lively (July 24, 1927). The manuscript, in blue-black ink on 12-line paper, was used for the engraving of the 1930 edition by Adolphe Henn in Geneva. Each study is signed at the end.