Professional singers who perform on cruise ships are known as cruise ship singers. Some cruise ship singers will sign a contract with a single cruise line and act only on that line’s ships, but others may sign multiple agreements with different cruise lines. On cruise ships, singers are usually part of a production that includes other performers such as musicians and dancers. Typically, these singers perform music that is appropriate for the situation. For example, a club singer may perform popular hits in a nightclub, whereas, in a lounge, a singer may perform jazz standards or novelty tunes.