“Just dance”

A little over halfway into Lady Gaga’s joyous, freaky, gothic, glorious, theatrical and even operatic “Mayhem Ball” concert at the Chase Center Tuesday night, she and her dancers broke out into an exuberant reprise of her 2008 debut single, the electro-pop banger, “Just Dance.”

They told the crowd of some 18,000: “Just dance, gonna be OK, Da-da-da-dance.”

Of course, these many Little Monsters did just that, though they had been out of their seats, clapping, stomping, grooving and screaming since the beginning of the more than two-hour show.

San Francisco is the second stop in Gaga’s six-month world tour, which kicked off July 16 in Las Vegas. She performs again Saturday night at the Chase Center, after Bay Area fans already showed their enthusiasm that highlights some of t

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