Mr.Moonlight ~Ai no Big Band~ (Mr.Moonlight 〜愛のビッグバンド〜; Mr. Moonlight ~Love's Big Band~) is the thirteenth single of J-pop idol group Morning Musume and was released on October 31, 2001. It sold a total of 513,340 copies and reached number one on the Oricon Charts. This single marks the debut of the fifth generation members Takahashi Ai, Konno Asami, Ogawa Makoto, and Niigaki Risa. The song exhibits heavy swing-style music influence, and the video featured the group dressed in outfits reminiscent of swing's peak era. Lead vocals are Yoshizawa Hitomi, Goto Maki, and Abe Natsumi. "Mr.Moonlight ~Ai no Big Band~" ranked as the #42 single for 2001.