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.
The three sections are written with no bar lines, implying a free metric structure.
Each piece is written in an elegant melody/accompaniment chorale style, exhibiting an interplay of two themes in austere but cleverly designed juxtaposition, with repetition and occasional departure from the initial exposition.
In 1988, Alan Gillmor of Carleton University, Ottawa, Ontario, published his Erik Satie.
Dr. Gillmor was led to explore this by research which suggested that, around the time of the composition of the Sonneries, Satie and Debussy had discussed the possibilities for using the Golden ratio in their work.