"Mr. Taxi" is the first original Japanese song recorded by South Korean girl group Girls' Generation. It was released as a double A-side single with the Japanese version of "Run Devil Run" on April 27, 2011, as the third single from the group's eponymous debut Japanese album. Composed by STY, Chad Royce and Scott Mann, with the Japanese lyrics written by STY and Korean lyrics written by Jung Hye-young, "Mr. Taxi" is an electropop and R&B song. A Korean version was later recorded and included on the group's third Korean studio album The Boys, and was released as the album's second single in December 2011. "Mr. Taxi" was a commercial success in Japan; it became the group's first single to sell 100,000 physical units in its first week of release. The single peaked at number two on the Oricon Singles Chart, number five on the RIAJ Digital Track Chart, and number one on the Japan Hot 100. It received certifications from the Recording Industry Association of Japan on four bases–physical sales (gold), PC downloads (platinum), chaku-uta (double platinum), and full-length chaku-uta (double platinum). "Mr. Taxi" was also successful in Taiwan, on whose record chart it charted at number three. The Korean version peaked at number nine on the Gaon Digital Chart and sold over 1.5 million digital units in South Korea in 2011. Background and composition Proceeds of the single were announced to be donated to the Japanese Red Cross. The double A-side single contains a Japanese version of their 2010 Korean single "Run Devil Run" which was released as a digital single on January 25, 2011. "Mr. Taxi / Run Devil Run" was the first release by the group that contained an original Japanese song, as all previous releases by the group in Japan had been covers of their Korean songs, "Gee" and "Genie". "Mr. Taxi / Run Devil Run" was released physically in Japan in three different editions on April 27, 2011: The regular edition only contains the CD. The deluxe first press edition contains the CD single, a mini-photobook of the members, a trading card, and a DVD containing the music video of "Run Devil Run" and a dance version. The limited period edition contains the CD, a DVD with the music video of "Run Devil Run", and a different photobook. The Japanese version of "Run Devil Run" was offered digitally through the Japanese iTunes Store starting