A cartoon by a man name Cage about a silent piano composition was published 20 years before John Cage's 4'33"

From Futility Closet:

In John Cages 1952 composition 433, the performer is instructed not to play his instrument.

American music critic Kyle Gann discovered this 1932 cartoon in The Etude, a magazine for pianists.

The cartoonists name, remarkably, is Hy Cage.