Brock Lesnar debuted in WWE in 2002 and was quickly billed as The Next Big Thing, a nickname that also became the name of his long-running entrance theme. Composed as a hard rock instrumental for his early run, the theme stayed with him through his return in 2012 and his later championship reigns. Its association with a former UFC heavyweight champion who moves between wrestling and MMA helped the music spread beyond wrestling shows into gym playlists, entrance parodies and combat sports edits online.