Getty Image If there was any timeless 1970s band you’d have expected Sabrina Carpenter to bring out during her Lollapalooza set, Earth Wind & Fire probably wouldn’t be high on the list. And yet, that’s exactly who she surprised fans with, inviting the funk-soul pioneers to join her onstage for rousing renditions of their generation-spanning hits, “Let’s Groove” and “September.” “Does anyone wanna dance tonight?” she asked the crowd. “I have this idea. Let’s see how you feel about it. I guess I just thought it would be really, really fun if I could bring out some friends for you guys,...

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