Opposing mainstream music is the music of subcultures. These opposing subcultures exist in most genres of music and is commonly found in punk rock, indie rock, and extreme metal, among others. In the 1960s, the music of the hippie counterculture exemplified this music. In more recent years, alternative rock, such as the music of Nirvana, has managed to maintain popularity in the mainstream music market even though their music did not conform to mainstream standards.