The 1940s were arguably Copland's most productive years, and some of his works from this period would cement his worldwide fame. His ballet scores for "Rodeo" (1942) and "Appalachian Spring" (1944) were huge successes. His pieces "Lincoln Portrait" and "Fanfare for the Common Man" became patriotic standards. Also important was the Third Symphony. Composed in a two-year period from 1944 to 1946, it became Copland's best-known symphony. The Clarinet Concerto (1948), scored for solo clarinet, strings, harp, and piano, was a commission piece for bandleader and clarinetist Benny Goodman and a complement to Copland's earlier jazz-influenced work, the Piano Concerto (1926). His "Four Piano Blues" is an introspective composition with a jazz influence. Copland finished the 1940s with two film scores, one for William Wyler's "The Heiress" and one for the film adaptation of John Steinbeck's novel "The Red Pony".