Most of the songs on "Back to Black" were solely written by Winehouse, as her primary focus of the album's sound shifted more towards the style of the girl groups from the 1950s and 1960s. Winehouse worked with New York singer Sharon Jones's longtime band, the Dap-Kings, to back her up in the studio and on tour. Her father, Mitch Winehouse, relates in his memoir, "Amy, My Daughter", how fascinating watching her process was, especially with witnessing her perfectionism in the studio. She would also put out what she had sung on a CD and play it in his taxi outside to know how most people would hear her music.