Thickfreakness was released on April 8, 2003, and received positive reviews from critics. The record spawned three singles: "Set You Free", "Hard Row", and a cover of Richard Berry's "Have Love, Will Travel". The other cover from the album was Junior Kimbrough's "Everywhere I Go". Time later named Thickfreakness the third-best album of 2003. That year, the duo received a lucrative offer of £200,000 to license one of their songs for use in an English mayonnaise advertisement. At the suggestion of their manager, they rejected the offer for fear of being perceived as "sell-outs" and alienating their fan base. The band toured extensively throughout 2003, playing its first dates outside of the United States and opening concerts for Sleater-Kinney, Beck, and Dashboard Confessional. However, exhaustion had set in by the end of the year, forcing the band to cancel European tour dates. In August, the group made its national television debut on Late Night with Conan O'Brien and performed at the Reading and Leeds Festivals. As fellow garage band the White Stripes grew in popularity, the Black Keys drew comparisons to them—sometimes as a derivative act—since both groups had two-piece lineups, Midwest origins, bluesy sounds, and names with colors. In September, the Black Keys released a split-EP with the Six Parts Seven titled The Six Parts Seven/The Black Keys EP, featuring one song by the Six Parts Seven and three songs by the Black Keys.
