4'33"

John Cage is a modern composer (1912-1992) who wrote some unusual pieces. You can listen to his 4'33" here and see it performed on piano here:



and here in an orchestral version:



Here's the GVSU New Music Ensemble sharing their version (includes tuning up):



and here is a version for acoustic guitar:





There are other versions on youtube performed by guitarists, soprano recorder and even angelfish.