His rare signature on a letter of agreement with Columbia Records, concerning recorded distribution of his live performance at the 1963 Newport Jazz Festival. Documentary Letter signed: "Thelonious Monk", 1 page, 8½x11. Forest Hills, N.Y., 1963 September 23. On letterhead of Columbia Records. Monk signs his assent to a letter referencing a prior agreement by him with Columbia Records (1962 July 30), and declaring that no additional compensation will be owed him for the recording of his performance at the 1963 Newport Jazz Festival unless the company issues a complete LP album featuring his performance exclusively. Jazz pianist and composer Thelonius Monk (1917-1982) has been called "the high priest of bebop," although his idiosyncratic style defies glib categorization. Several of his compositions, including Round Midnight and Blue Monk are classics of the genre. Although Monk had been performing since the early 1940s and had already written some of his classic songs, it was not until the mid-1950s that his avant-garde style began to attract a wide audience. In 1956 he released Brilliant Corners, considered one of the classic jazz albums of all time. Monk's reputation has only grown since his death: he received posthumously a special Pulitzer Prize for Music and a Grammy for Lifetime Achievement.