"He will shoot the show two times in front of two different audiences. It's straight-out music with interview segments to be spliced in, like the Adele concert (that ran on NBC last year)," a source told Us Weekly.
The source added that Mars, 31, and his band spent two days rehearsing for the show and the Grammy winner shot some footage at local Harlem businesses.
Several people also posted photos and clips online that showed the "24K Magic" singer performing on top of the Apollo marquee.
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