Claim: Nowth upon Nacht is a song for voice and piano by John Cage (pioneer of indeterminacy in music), composed in 1984 for Cathy Berberian, the celebrated soprano singer and wife of composer Luciano Berio.
Evidence: Nowth upon Nacht is a song for voice and piano by John Cage. A pioneer of indeterminacy in music, electroacoustic music, and non-standard use of musical instruments, Cage was one of the leading figures of the post-war avant-garde. It was composed in 1984 for Cathy Berberian, the celebrated soprano singer, wife of composer Luciano Berio.