Under the stage name "Bob Lennon", he wrote and performed the song , which was released on a CD included in the 2002 first pressing of volume 11 of "20th Century Boys". He released his debut single on June 4, 2008, and his debut album on November 29, 2008. A single featuring a remix of T. Rex's "20th Century Boy" and Urasawa's song "Bob Lennon (Kenji no Uta)" was released on August 19, 2009. Urasawa and Mitsuru Kuramoto wrote and performed under the name to be the theme of the 2011 NTT Docomo TV show "Tsubuyaki Sanshirō ~Ippon Nau!~". In 2012 he performed a Japanese cover of Bob Dylan's "Girl from the North Country" and "Guta lala suda lala" from his series "20th Century Boys" at the Japan Expo, and the following day he joined rock band Hemenway on stage.