The early 1970s saw the rise of a new style of country music that was as rough and hard-edged, and which quickly became the most popular form of country. This was outlaw country, a style that included such mainstream stars as Willie Nelson and Waylon Jennings. Outlaw country was very rock-oriented, and had lyrics that focused on the criminal, especially drug and alcohol-related, antics of its performers, who grew their hair long, wore denim and leather and looked like hippies in contrast to the clean-cut country singers that were pushing the Nashville sound.