For 10 points, name this American composer of Rodeo and Appalachian Spring.
Benny Goodman commissioned a clarinet concerto from this composer. One of his tone poems is about a "popular type dance hall in Mexico City" and is entitled El Salon Mexico. This composer included readings of this Gettysburg address in his Lincoln Portrait. One of this composer's ballets includes the sections (*) "Buckaroo Holiday" and "Hoe-Down." Another of his ballets includes an arrangement of the Shaker hymn "Simple Gifts." For 10 points, name this American composer of Rodeo and Appalachian Spring.
Benny Goodman commissioned a clarinet concerto from this composer.
Aaron {Copland}