The band performed "Spectrum (Say My Name)" to close out the show, but the real highlight came earlier, when Florence Welch joined Fallon for a rousing rendition of "Balls in Your Mouth" -- the ...

As Hurricane Isaac has caused old tar balls to reach shores again, it was an apt opportunity to bring back the track, and Welch gave the song’s earworm of a refrain – “Balls in your mouth ...