Greasers are a working-class youth subculture that was popularized in the late 1940s and 1950s by middle and lower class teenagers in the United States. Rock and roll music, and rockabilly, were major parts of the culture, and styles were influenced by singers like Elvis Presley, Johnny Cash, Carl Perkins, Jerry Lee Lewis, Conway Twitty, Chuck Berry, Little Richard, Bo Diddley, Eddie Cochran, Gene Vincent, Johnny Burnette, Vince Taylor and Ritchie Valens, but the two main figures of the look were Marlon Brando and James Dean. In the 1950s and 1960s, these youths were also known as "hoods," as in "hoodlums." This may be because the style was more popular in poor neighborhoods that had higher crime rates than upper-class neighborhoods.