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As the volatile decade of the 1960s unfolded, pop music (including rock) changed to reflect additional social, cultural, and political shifts—while continuing to influence these aspects of American life as well. Authorities made further attempts to “tame” rock, concerned about its influence on teenagers. These attempts sparked resistance from defiant young people, many of whom embraced rock musicians from Great Britain who hadn’t toned down their style. Two British groups in particular—the Beatles and the Rolling Stones—developed such unique and contrasting styles that rock split into distinctive types. Moreover, as pop music adapted to the times, it spun off several additional genres over the next few decades. These included soul, folk, and psychedelic music as well as country, punk, grunge, alternative, and hip-hop.