only released during the second OTSU concert held in May 2008. Both concerts were sponsored by Key Sounds Label, and both EPs were released on gramophone records. The first OTSU Club Music Compilation album primarily containing remixed music from Key's visual novels was released in June 2006. The second OTSU Club Music Compilation album was released in February 2008 as a promotion for the second concert, and contains remixed music from Little Busters!. The third OTSU release, OTSU:Blasterhead, contains remixed music from Key's visual novels and was released in February 2009. Concerts Key hosted a concert as a part of Key's tenth anniversary commemoration called KSL Live World 2008: Way to the Little Busters! EX which was held on May 10, 2008 in Tokyo, Japan, and again on May 17, 2008 in Osaka, Japan. Each time, the concert lasted for two and a half hours and featured songs sung by Lia, Rita, Chata, and Tomoe Tamiyasu who have previously sung songs for singles and albums released under Key Sounds Label. Tickets for the event were first available through mail order online on March 26, 2008. A two-CD remix album entitled KSL Live World 2008: Pamphlet and Memorial Disc was sold at both concert showings bearing the catalog numbers KSLC-0001—0002 and contains six remixed vocal versions of Kanon'''s opening theme "Last regrets" on the album's A-side; two of the tracks appeared on previous Key Sounds Label releases, and one is from the 1999 I've Sound compilation album Regret. The B-side of the album contains a recording of a group talk of the live performers from the concert. A live album containing the recording of the second concert held in Osaka was released in December 2008 entitled KSL Live World 2008: Way to the Little Busters! EX. Another concert called KSL Live World 2010: Way to the Kud-Wafter was held in Tokyo on May 21, 2010 and again twice more on May 22, 2010. The concert featured songs sung by Keiko Suzuki, Miyako Suzuta, Aoi Tada, Tomoe Tamiyasu, Chata, Marina, Lia, LiSA, Rita and Eufonius; however, Eufonius only appeared at the May 22 concerts. The MCs at the concerts were Shinji Orito and Rita; Jun Maeda also made appearances at the concerts. Tickets for the event were first available through mail order online on March 30, 2010. A live album containing the recording of one of the May 22 concerts was released