Live & Learn is the defining theme of Sonic Adventure 2, performed by Crush 40, the rock duo of guitarist and composer Jun Senoue and vocalist Johnny Gioeli. Originally released on the 2001 album CUTS UNLEASHED: SONIC ADVENTURE 2 VOCAL COLLECTION, the song serves as both the game's main theme and its climactic final boss music, where it plays with full vocals during the battle against the Biolizard. Its driving guitar riffs and defiant chorus, built around the mantra "Live and learn, hanging on the edge of tomorrow", have made it one of the most recognized tracks in video game music. In maimai, Live & Learn arrived during the GreeN PLUS update on August 22, 2014, and has remained a mainstay crossover track across every subsequent version. Its background video is drawn from Sonic Generations (console version) rather than Sonic Adventure 2 itself, a nod to Sega's later celebration of the series' history. The song's genre label within maimai has shifted over the years, from GAME to SEGA to ORIGINAL, before settling under GAME & VARIETY, reflecting the evolving categorization of Sega crossover content. At 172 BPM, the track is represented by two notable chart designs: Jack's Expert arrangement and Techno Kitchen's Master chart, which packs 660 notes including 75 Break notes at a 13.3 difficulty constant. The song's difficulty ratings have also been revised upward across multiple maimai version updates to keep pace with the arcade's shifting difficulty scale.