 After Butler had given Duffy a soul music "education" by downloading tracks on to her iPod that she could listen to while around London or travelling back to Wales, the pair co-wrote with her and helped create a new retro sound.The music included tracks by Al Green, Bettye Swann, Ann Peebles, Doris Duke, Scott Walker, Phil Spector and Burt Bacharach.Duffy described Bettye Swann as one of her biggest inspirations, particularly her song "Cover Me".