Premise: Trois sonneries de la Rose+Croix ("Three Sonneries of the Rose+Cross") is a piano composition by Erik Satie, first published in 1892, while he was composer and chapel-master of the Rosicrucian "Ordre de la Rose-Croix Catholique, du Temple et du Graal ", led by Sâr Joséphin Péladan.
Hypothesis: Erik Satie was a composer and musician.