dienasgramata:

Cage was not the first composer to conceive of a piece consisting solely of silence. One precedent is "In futurum", a movement from the Fünf Pittoresken for piano by Czech composer Erwin Schulhoff. Written in 1919, Schulhoff's meticulously notated composition is made up entirely of rests.[10] Cage was, however, almost certainly unaware of Schulhoff's work. Another prior example is Alphonse Allais's Funeral March for the Obsequies of a Deaf Man, written in 1897, and consisting of nine blank measures. Allais's composition is arguably closer in spirit to Cage's work; Allais was an associate of Erik Satie, and given Cage's profound admiration for Satie, the possibility that Cage was inspired by the Funeral March is tempting. However, according to Cage himself, he was unaware of Allais's composition at the time (though he had heard of a 19th-century book that was completely blank).