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Emerging out of the experimental and ambitious years of late-60s psychedelia, rock splintered into a variety of styles in the 1970s as the music business continued to expand. By the end of the decade, punk and disco had challenged the excesses of the hippie aesthetic, as rock became more commercially streamlined and radio friendly. The emergence and rise of MTV transformed pop music and propelled the careers of Michael jackson and Madonna, while heavy metal and hip hop dominated the late 1980s. Nirvana leads alt-rock's return to simplicity in the early 1990s.