By 2014, the days of a hard-working band catching their break on late night TV were supposed to be over, at least until Future Islands proved everyone wrong. Clever synth-pop number ‘Seasons (Waiting on You)’ was elevated so much by frontman Samuel T Herring’s performance on David Letterman that they were catapulted onto another level. His hip swaying, chest beating, growling run through the song was almost comically sincere, downright bizarre, and completely captivating. It soon went viral, inspiring GIFs and blog posts aplenty. It even collected prestigious ‘Song of the Year’ gongs from Pitchfork, NME, Spin and others, while…