LIT: John Cage: Silence. Lectures and writings by J.C., Middletown/Connecticut 1961; John Cage, Empty Words. Writings '73-'78, Midletown/Connecticut 1979; Emanuel Dimas de Melo Pimenta: John Cage. The Silence of Music, Mailand 2003; Hans-Friedrich Bormann: Verschwiegene Stille. John Cages performative Ästhetik, München 2005.