And Lollapalooza put her on a stage that, by the time her set was over, felt like the most honest mistake of the weekend. Sienna SpiroStanding in that crowd Saturday, the first thing you noticed wasn’t even the voice — it was the band. Spiro has a contralto that belongs on a stage three times the size of the one she was on. “I think people are connecting with that real sound,” frontman Eddie Keogh told us, “and they’re finding it in real musicians using real, traditional instruments.” And the size of the crowd that showed up for them tells you this isn’t a niche moment.