"Wild" is a song by Japanese recording artist Namie Amuro from her ninth studio album ''Past'' (2009). The song was released as the album's lead single on March 18, 2009, featuring the b-side "Dr.". "Wild" was written and produced by Michio and T. Kura, while the latter track was written and produced by long-time collaborator Nao'ymt. The songs are electropop tracks, which features instrumentation from synthesizers and keyboards. "Wild" and "Dr." appeared as the advertising theme songs for Coca-Cola Zero and a Vidal Sassoon commercial The songs received positive reviews from music critics, who commended the songs composition and production. Charting as a double a-side, "Wild/Dr." became Amuro's first number one single on the Japanese Oricon Singles Chart since her 1998 single "I Have Never Seen" and her tenth number one overall. Videos for both "Wild" and "Dr." were shot, the first being set on a futuristic planet while the latter was Amuro's first animated video. Both "Wild" and "Dr." have been included on two concert tours conduced by Amuro, including her ''Namie Amuro Best Fiction tour 2008–2009'' and ''Namie Amuro Past==Background and composition== Reviving her sales decline with her 2007 album ''Play'' and her million-selling greatest hits album ''Best Fiction'', Amuro begun recording her ninth studio album in early-2009. While she was promoting ''Best Fiction'' on her Best Fiction Tour, Amuro confirmed that all future singles would be revealed through commercial endorsements deals rather than being pre-released independently; both "Wild" and "Dr." appeared as the advertising theme songs for Coca-Cola Zero and a Vidal Sassoon commercial.〔(【引用サイトリンク】 title=Vidal Sassoon Commercial featuring Namie Amuro )〕 Written by Minchio and produced by T.Kura, "Wild" is an uptempo electropop song that incorporates synthesizers and keyboards by Nao'ymt.〔(【引用サイトリンク】 title=Namie Amuro – Wild/Dr. )〕 "Dr." is an R&B and Opera-inspired dance-pop song that was produced by Nao'ymt.〔〔(【引用サイトリンク】 title=Namie Amuro: Wild )〕 "Dr." features a stacatto marching band during its first and second verses,〔 and both songs were recorded by Ryosuke Kataoka at Azabu-O-Studio, Tokyo.〔〔 The songs were mastered by Tom Coyne at Sterling Sound Studios, New York.〔