Alternative rock (also called alternative music, alt-rock or simplyalternative) is a genre of rock music that emerged in the 1980s and became widely popular in the 1990s. Alternative rock consists of various subgenres thathave emerged from the independent music scene since the 1980s, such as grunge, Britpop, gothic rock, and indie pop. These genres are unified by their collectivedebt to the style and/or ethos of punk rock, which laid the groundwork for alternative music in the 1970s. At times alternative rock has been used as acatch-all phrase for rock music from underground artists in the 1980s, and all music descended from punk rock (including punk itself, New Wave, and post-punk).Rock music is a genre of popular music that entered the mainstream in the 1960s. It has its roots in 1940s and 1950s rock and roll, rhythm and blues, countrymusic and also drew on folk music, jazz and classical music. The sound of rock often revolves around the electric guitar, bass guitar, drums, and keyboardinstruments such as hammond organ, piano, or, since the late 60s, synthesizers.
In the late 1960s and early 1970s, rock music developed different subgenres.