This quintet of hard-partying Brits recalls the wild days of New Kids on the Block, sans the sex scandal (thus far). The group’s string of hits includes “Glad You Came,” which is loaded with naughty double entendres. Dress code: Plunging V-necks, tight pants, and faux-rugged work boots. Dance party: Jumping frantically in place while air-punching—repeated ad infinitum. Fan base: Frighteningly extremist—some threatened mortal harm upon the Dublin music critic who wrote an unfavorable review.