text:  That voice belongs to Florence Welch, who leads the band Florence and the Machine, and she wrote music and lyrics to this version of Gatsby. Welch started her career at clubs in London before fronting the band's debut album in 2009. Their third album went to number one in the U.S. Ten years into the band's run, Florence Welch joined us at the New Yorker Festival along with her band, and she sat down for an interview with John Seabrook.