Theatrical singers are live performers who often perform nightly performances at a theatre. Opera singers are a specialization of theatrical singers that typically perform in a home theatre they are employed by. A theatrical singer in a main role will usually have their own dressing room and voice coach. Supporting or back-up singers will often share a common dressing area and receive less perks than a singer in a main role. Professional recording singers exist outside of the entertainment industry in small numbers and are typically employed in marketing sectors for use in marketing jingles and advertisements. These singers will usually work as collaborators and writers of the pieces they sing and will work out of an office.