Most nation states have an anthem, defined as "a song, as of praise, devotion, or patriotism"; most anthems are either marches or hymns in style. A song or hymn can become a national anthem under the state's constitution, by a law enacted by its legislature, or simply by tradition. A royal anthem is a patriotic song similar to a national anthem, but it specifically praises or prays for a monarch or royal dynasty. Such anthems are usually performed at public appearances by the monarch or during other events of royal importance. Some states use their royal anthem as the national anthem, such as the state anthem of Jordan.