By the early part of the 1960s, however, the Nashville sound had become perceived as too watered-down by many more traditionalist performers and fans, resulting in a number of local scenes like the Bakersfield sound. A few performers retained popularity, however, such as the long-standing cultural icon Johnny Cash. The Bakersfield sound began in the mid to late 1950s when performers like Wynn Stewart and Buck Owens began using elements of Western swing and rock, such as the breakbeat, in their music. In the 1960s performers like Merle Haggard popularized the sound. In the early 1970s, Haggard was also part of outlaw country, alongside singer-songwriters such as Willie Nelson and Waylon Jennings. Outlaw country was rock-oriented and lyrically focused on the criminal antics of the performers, in contrast to the clean-cut country singers of the Nashville sound. By the middle of the 1980s, the country music charts were dominated by pop singers, alongside a nascent revival of honky-tonk-style country with the rise of performers like Dwight Yoakam. The 1980s also saw the development of alternative country performers like Uncle Tupelo, who were opposed to the more pop-oriented style of mainstream country. At the beginning of the 2000s, rock-oriented country acts remained among the best-selling performers in the United States, especially Garth Brooks.