Henri Paul Julien Dutilleux (22 January 1916 – 22 May 2013) was a French composer of late 20th-century classical music. Among the leading French composers of his time, his work was rooted in the Impressionistic style of Debussy and Ravel, but in an idiosyncratic, individual style. Among his best known works are his early Flute Sonatine and Piano Sonata; concertos for cello, Tout un monde lointain... ("A whole distant world") and violin, L'arbre des songes ("The tree of dreams"); a string quartet known as Ainsi la nuit ("Thus the night"); and two symphonies: No. 1 (1951) and No. 2 Le Double (1959).