Boléro is a one-movement orchestral composition by French composer Maurice Ravel, completed in 1928. The work is built on a repeated ostinato rhythm and a single melodic motif that is passed among sections of the orchestra with gradual changes in instrumentation and dynamics, serving as an exploration of orchestration and gradual crescendo that occupies a distinctive place in Ravel's output and in early 20th-century orchestral repertoire.
