Some games are developed as tie-ins to the release of another property as to help with that property's marketing and promotion, such as Superman 64 which was used as a tie-in to Superman: The Animated Series In other cases, games may simply used the licensed setting outside of the tie-in function, such as in the case of Batman: Arkham Asylum.[57] Many games incorporate existing contemporary music from famous bands and musicians, each which must be licensed individuals.