 On August 27, Tohoshinki released the official track list for "Tone", which included "Back to Tomorrow" and "B.U.T," the album's pre-release lead single.Tohoshinki debuted their first performance of "B.U.T" at the SM Town World Tour in Tokyo Dome on September 2, 2011.Following their Tokyo Dome performance, Tohoshinki released a preview of the PV for "B.U.T" on September 6.