thumb|A luthéal The luthéal is a kind of hybrid piano which extended the "register" possibilities of a piano by producing cimbalom-like sounds in some registers, exploiting harmonics of the strings when pulling other register-stops, and also some registers making other objects, which were lowered just above the strings, resound. The instrument became obsolete partly because most of its mechanics were too sensitive, needing constant adjustment. The only pieces in the general repertoire to feature the luthéal are ''L'enfant et les sortilèges (1920–25) and Tzigane'' (1924), by Maurice Ravel.
thumb|A luthéal The luthéal is a kind of hybrid piano which extended the "register" possibilities of a piano by producing cimbalom-like sounds in some registers, exploiting harmonics of the strings when pulling other register-stops, and also some registers making other objects, which were lowered just above the strings, resound. The instrument became obsolete partly because most of its mechanics were too sensitive, needing constant adjustment. The only pieces in the general repertoire to feature the luthéal are ''L'enfant et les sortilèges (1920–25) and Tzigane (1924), by Maurice Ravel.
==History== The attachment was created by the Belgian organ builder Georges Cloetens, who first patented it on 28 January 1919 and named it the "Jeu de harpe tirée". Maurice Ravel used it in Tzigane for violin and piano, and in the opera L'Enfant et les sortilèges''.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).