Oak Ridge Boys February 26, 2010

One of the longest-running groups in country music, the Oak Ridge Boys started life as a gospel quartet before gradually modernizing their style and moving into secular country-pop. Yet even at the height of their popularity in the late '70s and early '80s -- when they were big enough to cross over to the pop charts -- their sound always remained deeply rooted in country gospel harmony. The band has a string of chart topping hits including nine No. 1 country songs between 1984 and 1990.

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