File contains eleven harmony workbooks used by Ellen Ballon, including notes and exercises. Two books are labelled "Mr. Goldmark Harmony Book," in reference to her harmony teacher in New York, Rubin Goldmark. Another book includes an inserted repertoire list of piano compositions, composers, and times, presumably related to her piano lessons with Rafael Joseffy.
File contains a piano technique book used by Ellen Ballon while she was studying with Alberto Jonas in New York. Each page includes printed technical excercises and blank staff lines with some additions handwritten in pencil, presumably by Jonas or Ballon. The book includes a repertoire list of pieces Ballon performed in 1918-1919.
File contains a piano technique book used and annotated by Ellen Ballon. It is the third book in a set of three, dedicated to Rafael Joseffy. It includes studies by composers from Ludwig van Beethoven until the book's publication.