Disco choreographer Doriana Sanchez fills her minute and a half So You Think You Can Dance routines with some of the competition’s most astounding lifts, twists, and twirls, making them more than just a throwback to the 1970s movie Saturday Night Fever. While Doriana’s routines are always entertaining, we have to stop and wonder … what exactly is disco dancing?With influences from Latin dances such as the cha cha and samba, disco dancing became popular during the craze of disco...

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