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Even if you think you don’t know this classic English art-rock band, you’ve probably heard its indelible radio staples such as “I’m Not in Love” and “The Things We Do for Love.” Precariously balanced between an arty faction (Kevin Godley and Lol Creme) and a pure-pop duo (Graham Gouldman and Eric Stewart), the band was fractious even at its peak; now it’s just Gouldman as the main creative force—but that’s no small thing.