The knock on benefits for musicians from an Earth Wind and Fire revival could be enormous. A tribute band would require two guitars, three percussionists, two sax players, two trumpeters, a trombonist, a bass player, a keyboard player, a random bloke in a sci-fi costume who twirls across the stage and whose function is unclear, two lead singers and three female backing singers capable of doing the Emotions' back catalogue. Unemployment would be a thing of the past.