Aaron Copland's Clarinet Concerto was written between 1947 and 1949, although a first version was available in 1948. This composition is also sometimes referred to as the Concerto for Clarinet, Strings and Harp. The concerto was later choreographed by Jerome Robbins for the ballet Pied Piper (1951).
Soon after Copland composed his Symphony No. 3, in 1947 jazz clarinetist Benny Goodman commissioned him to write a concerto for clarinet. Goodman told Copland biographer Vivian Perlis:
I made no demands on what Copland should write. He had completely free rein, except that I should have a two-year exclusivity on playing the work. I paid two thousand dollars and that's real money. At the time there were not too many American composers to pick from... We never had much trouble except for a little fracas about the spot before the cadenza where he had written a repetition of some phrase. I was a little sticky about leaving it out—it was where the viola was the echo to give the clarinet a cue. But I think Aaron finally did leave it out... Aaron and I played the concerto quite a few times with him conducting, and we made two recordings"
Copland was in Rio de Janeiro in 1947 as a lecturer and conductor. While there he made many drafts of the concerto. On August 26, 1948, Copland wrote that the concerto was still "dribbling along". A month later, he wrote in a letter that the piece was almost done. On December 6, 1948, he wrote to composer Carlos Chavez that he had completed the composition and was pleased with the result.
Copland accepted a commission from conductor Serge Koussevitzky to arrange the concerto's first movement as an Elegy for Strings, to be performed by the Boston Symphony. However, in a letter to Koussevitzky dated August 29, 1950, Copland backed away from the commission. The composer explained that, after further thought, he believed that performing an arrangement of the first movement by itself "takes away from the integrity of the Concerto as I originally conceived it, and I am basically unwilling to do that". Copland was also concerned, he wrote, that a performance of the concerto's first movement by itself when the concerto still had not been performed—Goodman repeatedly postponed his premier of the piece—might be misperceived by the public as expressing doubt about the quality of the concerto's second movement. He proposed a different way to satisfy his commitment for an elegy.