This thesis examines a collection of three songs, "In Flanders Fields," "He Is There!," and "Tom Sails Away," written by Charles Ives in 1917, from primarily a literary perspective involving Transcendentalism and intertextuality. Ives's aesthetic builds upon the principles of Transcendentalism. I examine these songs using the principles outlined by the nineteenth-century Transcendentalists, and Ives's interpretations of these beliefs. Another characteristic of Ives's music is quotation. "Intertextuality" describes an interdependence of literary texts through quotation. I also examine these songs using the principles of intertextuality and Ives's uses of intertextual elements. Familiarity with the primary sources Ives quotes and the texts they suggest adds new meaning to his works. Transcendentalism and intertextuality create a greater understanding of Ives's conflicting views of the morality of war.