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Entrance music (also known as an entry theme or walk-on music) is a musical piece or song that is played for athletes or entertainers when they first appear in front of the spectators before beginning a performance. Popular music acts may have recorded intro and/or outro music played before and after a concert performance, which is often of a different genre from that of the act's own live music. Acts often retain a single signature tune throughout their career; music acts typically retain the same intro/outro at least for a whole concert tour.