Interviews with avant-garde composers by musicologist Olivia Mattis, conducted while Mattis was a doctoral student at Stanford University studying Edgard Varèse. Thus, many of the subjects are family and associates of Varèse (many of whom are from the art world rather than music), and his name tends to come up in many of the interviews. Mattis was also the first person to interview Léon Thérémin after he emerged from over fifty years of Soviet seclusion in 1989. While the transcript for this interview has been published, less commonly found is the recording from the same tape of a theremin demonstration played by his daughter Natalia. The collection also contains a rare interview with rock musician Frank Zappa, a known Varèse acolyte. Musicians, conductors, and artists are also among the interviewed. Sessions were in English and other languages (French, Russian) with an interpreter, and took place for the most part in Paris and New York City. These first generation copies (most of which have never been played) were dubbed from her original audiocassettes between 1989 and 1990, while Mattis was briefly employed at the Archive of Recorded Sound. Copies also appear to have been deposited at Yale University.