In Appalachian Spring, Aaron Copland creates a unique tonal environment. Although often considered a tonal work, it contains many non-functional progressions and techniques that belie common-practice norms. The entire first movement, and sections of other movements contain no harmonic motion, in part because tonic and dominant chords sound together as a single sonority. In other movements, harmonic motion, in part because tonic and dominant chords sound together as a single sonority. In other movements, harmonic motion is increased by shifts to third-related keys, and non-functional progressions. Also, the variations on the melody "Simple Gifts" never employ common-practice techniques. Through the free use of materials, Copland creates an individualistic example of tonality in twentieth-century music.