"Ain't No Other Man" was written and produced by Aguilera, DJ Premier, and Charles Roane, with additional songwriting provided by Harold Beatty and Kara DioGuardi [REF].
In 2011, American publishing company TufAmeria sued Sony Music for the brass sample of Dave Cortez & The Moon People's "Hippy Skippy Moon Strut" (1968) on "Ain't No Other Man".