For 10 points, name this composer of Boléro.
One work by this composer features a B-flat octave ostinato and is titled after the gallows, while another work is based on an Aloysius Bertrand poem about a water sprite. This composer of Le Gibet and Ondine, part of his piece for solo piano Gaspard de la Nuit, also composed a "choreographic symphony" about a goatherd and shepherdess, in  his ballet, Daphnis et Chloé. Ida Rubenstein commissioned a work by this man featuring a steadily increasing orchestra crescendo alongside an ostinato snare drum. For 10 points, name this composer of Boléro.
One work by this composer features a B-flat octave ostinato and is titled after the gallows, while another work is based on an Aloysius Bertrand poem about a water sprite.
Maurice {Ravel}