Some casting directors will also send agents 'sides'. Sides are small portions of the script that the director wants read at the audition. Background casting, while not as complex as principal casting still requires attention to detail. The background casting director will typically provide talent agents with a list of necessary criteria and the required numbers of performers. Auditions are not usually required for background performers. An audition is a sample performance by an actor, singer, musician, dancer or other performing artist.
