Since the celebration of his centennial in 1974, Charles Ives has become an iconic figure in the history of music; his name and compositions are widely recognized, and his influence has been felt throughout the world. One of the most striking features of Ives’s music is his use of the borrowed melodies that pervade his scores. Ives drew extensively from a large historical repertoire, some of it little known today, including hymns, military and patriotic music, college and popular songs, instrumental music, and “classical” music models. By cataloging these sources and including musical examples of their incorporation into Ives’s music, Clayton W. Henderson provides important insights into the composer’s body of work.