Hy Cage or
John Cage?
John Cage's most famous work, 4'33" (1952) is a piece where the performer is given no sounds to play: each movement is Tacet (silent.) Although the instrumentation is not specified, it was first performed by pianist David Tudor. It does indeed take practice (with a clock). This cartoon (1932) predates that composition by twenty years.

video"4'33" video

The Etude, September 1932, p668
© Theodore Presser Publishers. Used with permission.