Thania Garcia Florence Welch and the Machine appeared on “The Tonight Show With Jimmy Fallon” on Wednesday night to promote the band’s new album “Dance Fever.”But before the singer performed her danceable new single “My Love, Welch joined Jimmy Buffet for a surprise duet of his 1977 classic, “Margaritaville.” Fallon, of course, couldn’t help but jump in.Audience Suggestion Box: @jimmybuffett and @florencemachine sing “Margaritaville”. #FallonTonight pic.twitter.com/cL89tmHzqJ— The Tonight Show (@FallonTonight) May 12, 2022Clearly enjoying the made-for-TV moment, the unlikely trio smiled throughout the performing, trailing off towards the end of cocktail anthem.Welch then sat down for a conversation with Fallon about her new music.