John Milton Cage Jr. is one of the most influential American composers and music theorists of the 20th century. Known for his experimental approach to composition and dedication to exploring the boundaries of musical expression, Cage is often referred to as a pioneer of the avant-garde movement in music. While there are no exact synonyms for his name, it is often shortened to simply "John Cage" or referred to as J.M. Cage. Additionally, some may describe him as a boundary-pushing artist or a composer of experimental music. Ultimately, whatever term is used, the impact of Cage's work on the world of music is undeniable.