The Memos are a collection of Ives’s previously unpublished writings from the early 1930s onward, compiled and annotated by John Kirkpatrick. Published in 1972, the compilation is organized into three parts: “Pretext,” “Scrapbook,” and “Memories.” Kirkpatrick also includes twenty-one appendices, which range in content from Ives’s responses to Kirkpatrick’s questions on the Concord Sonata, to plans for an operatic libretto in collaboration with his wife, Harmony.