musical theme. The game features performances by returning vocalists Tony Harnell, Ted Poley, Marlon Saunders, Nikki Gregoroff and Johnny Gioeli, and new vocalists Tabitha Fair, Todd Cooper, Paul Shortino, Everett Bradley, Kaz Silver and Hunnid-P. Crush 40 (consisting of Senoue and Gioeli) debuted on the game's main theme, "Live and Learn". Production of the music lasted from April 2000 to February 2001; after this Senoue, along with others, created sound effects. The team wanted Sonic Adventure 2 audio to stand out, rather than merely serving as background music. Senoue felt that some of Sonic Adventure tracks were not as memorable as others. He and the Wave Master musicians made a pact with them "to write songs that promoted the game's speed and situations while keeping the best tempo of the stage". Senoue wrote each track before producing a demo version, and mixed them with a Yamaha digital console and Mackie analog mixer. He edited tracks using a Mac. After Sonic Team approved the music, Senoue finished sequencing it and sent it to the musicians for production. Several soundtrack albums for the game were released. Sonic Adventure 2 Multi-Dimensional Original Soundtrack was released in Japan by Marvelous Entertainment on September 5, 2001. Sonic Adventure 2 Vocals Collection: Cuts Unleashed, an album with character theme tracks by Senoue and Tokoi, was released by MMV in Japan on August 21, 2001. For the 20th anniversary of the Sonic series, Sonic Adventure 2 Original Soundtrack 20th Anniversary Edition was released on iTunes on June 22, 2011. On October 29, 2014, a two-volume original soundtrack was released on iTunes. The soundtrack was also released as a vinyl LP by Brave Wave Productions in January 2018, and includes interviews with Senoue and Iizuka. Re-releases Sonic Adventure 2: Battle In January 2001, Sega departed the console business to be a software publisher. Sonic Adventure 2 was ported to the Nintendo GameCube as Sonic Adventure 2: Battle on December 20, 2001. Battle has more detailed textures and additional geometry, and adds multiplayer options including new abilities, upgrades, and exclusive characters. Big the Cat is replaced by a Dark Chao in multiplayer mode. Battle also upgrades much of the Chao system, with a Chao's stats viewable within the game, and the option to transfer Chao from Sonic Adventure 2 Battle to the Tiny Chao Garden in Sonic Advance, Sonic Advance 2, and Sonic Pinball Party with the GameCube –