It turns out that Cooper had a similarly clear idea of who to base Jackson’s look on—another legend in his artistic field, Pearl Jam front man Eddie Vedder. “I went up to Seattle and spent four or five days with [Vedder] and I asked him 9,000 questions,” Cooper told Yahoo. “And he gave me minor, little things that only musicians know about what to do, just aesthetically and the inner workings. . . . He was wonderful.” When Cooper told Vedder about his plan to actually sing in the film, the Pearl Jam front man was less than encouraging: Cooper laughed. “He was like, ‘What? Bro, don’t do that.’”