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 Cage's 1952 composition 4'33", 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 cartoonist's name, remarkably, is Hy Cage.