live, and later released a DVD, titled Wonderful World on Dec. 21. In June 2003 Sakurai help co-found AP Bank, a non-profit bank, with a goal of tackling environmental problems. Along with music producer Takeshi Kobayashi, and world-renowned composer Ryuichi Sakamoto, the bank invests only in environmentally friendly projects such as renewable energy. Together the 3 men invested 100 million yen each. "AP" is short for both Artists Power and Alternative Power. Artists Power is a project started in 2001 by Ryuichi Sakamoto and Takuro of Glay.<ref name="Artists Power"></ref</ref> In addition to the bank, Sakurai also co-started AP Bank fes., a yearly festival that raises awareness about environmental issues such as recycling and global warming, with all profits from the festival going to fund more projects at AP Bank. As a solo act, Sakurai co-wrote and sung the single with Gaku-MC on May 31, 2006, and as Bank Band, he teamed up with Salyu to release the song 'to U' on July 19, 2006. In 2007, he was a guest vocal on Kai Yoshihiro's 10 Stories album which did a cover song of and appeared as a secret guest at Golden Circle Vol.10 on April 8 and 9. Sakurai along with Yumi Matsutoya, Yohito Teraoka, and Yuzu performed "Dandelion", "Mamotte Agetai", "Destiny", "Natsu Iro" and "Music". From the songs performed, Sakurai co-wrote the lyrics to "Music" which was later released on July 11, 2007, but did not join in the recording of the single. With Bank Band, Sakurai announced in July 2007 he had written a new theme song for "ap bank fes. '07" titled . On September 1, 2007, Bank Band released their first iTunes only song titled . The song was used as the theme song for the Japanese movie Midnight Eagle, with the lyrics written by Kazutoshi Sakurai. Part of the profits from the song were donated to people affected by the Niigata earthquake, with the rest of the profits going to fund more projects at AP Bank. He released his second album with Bank Band in 2008, and in 2010, he released another album with Bank Band. On May 13, 2020, it was revealed that Sakurai had written the song "Smile", which would be sung by Johnny & Associates artists' special unit "Twenty★Twenty", that includes Arashi, KAT-TUN, V6, King & Prince, SixTones and others, as part of Johnny's charity activity "Smile Up Project". This is the