Music that is thought to be highly innovative or ahead of its time. Avant-garde music necessarily pushes the boundaries of what is acceptable as "music" to specialists as well as to the population at large. Historically speaking, musicologists primarily use the term "avant-garde music" for the radical, post-1945 tendencies Modernism in several genres of art music after the death of Anton Webern in 1945. In the 1950s the term was mostly associated with serial music. Read more on Last.fm.