Experimental and avant-garde music in the modern era pushed boundaries and challenged traditional conventions. Composers like Schoenberg, Cage, and Stockhausen pioneered techniques such as atonality, indeterminacy, and electronic manipulation, revolutionizing the musical landscape. These innovations influenced various genres beyond classical music, including rock, jazz, and electronic. Avant-garde approaches continue to shape contemporary music, inspiring new forms of expression and expanding the definition of what constitutes music itself.