Clockwise from top left: Cyndi Lauper: “Girls Just Want To Have Fun”; a-ha: “Take On Me”; Madonna: “Vogue”; Beyonce: “Single Ladies”; Eurythmics: “Sweet Dreams”; R.E.M.: “Losing My Religion”; Nirvana: “Smells Like Teen Spirit.” (Screenshots: YouTube)Graphic: Libby McGuire Ever since it launched back on August 1, 1981, MTV has been a constant reminder of the central role music videos play in pop cu
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