Across five studio albums, Florence and the Machine has explored genres from pop to punk and soul; the band’s most recent record, “Dance Fever,” just came out. Florence Welch, the group’s singer and main songwriter, is by turns introspective and theatrical, poetic and confessional. She sat down with John Seabrook at The New Yorker Festival in 2019 to reflect on her band’s rapid rise to stardom. She also spoke about her turn toward sobriety after years of heavy drinking. “The first year that I stopped, I felt like I’d really lost a big part of who I was and how I understood myself,” she says. “What I understood is that that was rock and roll, and, if you couldn’t go the hardest, you were letting rock and roll down.” But eventually getting sober let her connect more deeply with fans and with the music. “To be conscious and to be present and to really feel what’s going on—even though it’s painful, it feels like much more a truly reborn spirit of rock and roll,” she says.