“Don’t be scared. I’ve done this before,” Lady Gaga declared Saturday, midway into what may have been the weekend’s most anticipated main-stage set. She was a provocative, late addition to the lineup, stepping in after the advanced pregnancy of Beyoncé forced her to bow out. But which version of Mother Monster would be delivered at Gagachella? Would she wrap herself in an otherworldly costume from the art world? Would Tony Bennett show up? Metallica? Instead, the singer delivered a 90-minute set focused on her broadest, core appeal, with no guest stars – just a night of dance-floor pop (and a bit of rock) on romance and self-determination, occasional flames and fireworks in the sky above, and a stage full of dancers. She stepped out to the fast-paced “Scheiße” while crouching in a long leather coat and military cap, a bright light shining from her belt buckle. But soon she peeled down to a leotard for a tight action-packed series of songs (“LoveGame,” “John Wayne,” “Just Dance,” “Born This Way,” “Venus”), and asked the packed field in front of her, “You guys having a good time tonight? You find anybody you want to sleep with yet?” Behind the piano, Gaga stripped things down, turning “The Edge of Glory” into a piano ballad, dropping in the aside: “Playing for 100,000 people? Not too shabby.” She debuted a new dance song, “The Cure,” to a warm reception. Overall, it was a mostly flawless performance representing her most accessible side. Some fans might have wondered where the artsy extremist went off to (other than an onscreen glimpse of her with a octopus tentacle in her mouth). At Coachella, Gaga came to dance.