Rhythm Changes was composed in 2002 for Cologne-based duo lirico, who gave the premiere of the work in January 2003. My preceding works, Dialogues for viola and piano and LINES/ANGLES for orchestra, had been growing in harmonic and melodic complexity. Rhythm Changes represented a shift to a more lighthearted affect and an embrace of my American musical heritage. As the title suggests, it pays homage to Gershwin and to the jazz tradition of building new works on the harmonic progression (“changes”) from “I Got Rhythm”, though highly sublimated. Unable to resist the musical pun, the work is also an exploration of constantly shifting rhythms.