Speeches, writings, and teaching materials are housed in Boxes 910. They contain, among other items, versions of "The Craft of Musical Composition, Parts I-II-III-IV," materials and proofs for "Traditional Harmony, Parts I-II," "Elementary Training for Musicians," "The Composer's World," autographed copies of the lecture on J. S. Bach in English and German, and other writings. Some additional materials may be found in oversize Box 43.