In show business , a guest appearance is the participation of an outsider performer (such as a musician or actor ) in an event such as a music record or concert , show, etc., when the performer does not belong to the regular cast, band or other performing group. In music , such an outside performer is often referred to as a guest artist . In performance art , the terms guest role or guest star are also common, the latter term specifically indicating the guest appearance of a celebrity . The latter is often also credited as "special guest star " or "special musical guest star " by some production companies.
In pop music , guest appearances are often described with the words featuring, with, or and. It is abbreviated in credit lists as feat., ft., f/, f..
In a television series , a guest star is an actor who appears in one or a few episodes.
In radio and television shows, a guest star is a guest of the show who is a celebrity .