Ad for A Mathematical Theory of Context Creation, 1981

The Cage Correspondence collection is comprised of correspondence and ephemera including letters, cards, clippings, catalogs, photographs, negatives, cassette tapes, music scores, and art.  Early materials focus on family correspondence and newspaper clippings and are interspersed with Cage's own notes and manuscripts.  Later correspondence is enhanced through Cage's use of "Note-o-Grams" which provides carbon copies of his sent messages.