Outlaw country is a subgenre of country music that emerged in the 1960s and 1970s as a rebellion against the mainstream Nashville sound. It is characterized by its raw, gritty sound, and its lyrics that often depict the hard-living, hard-drinking lifestyles of its performers. Outlaw country artists such as Willie Nelson, Waylon Jennings, and Johnny Cash became popular for their outlaw image and their rejection of the polished, commercialized sound of mainstream country.