Playbill listings are a type of theater program that provides information about a show. The listings typically include the CAST, bios, and roles of the performers. The term 'CAST' is used to refer to the group of actors and actresses in a production, and is typically abbreviated to five letters. Bios are short biographies of the performers, and are usually abbreviated to four letters. Lastly, roles refer to the parts that the performers play in the production, and are typically abbreviated to five letters.