A radio station is a broadcasting service that can be listened to in a vehicle or on a standalone radio player. They feature in every Grand Theft Auto game, and are accessible from almost any vehicle (except some such as bikes or emergency vehicles). Most radio stations play songs with a DJ and commercials between them; other stations are primarily discussion-based. Emergency services channels are not considered radio stations. Emergency vehicles do not play public radio, except in multiplayer. Each radio station focuses on one theme or music genre. Some PC versions have the functionality for Custom Radio Stations.