A State of Trance (often abbreviated as ASOT) is the title of a weekly radio show (every Saturday at 20:00 (CET)) hosted by prominent trance DJ and producer Armin van Buuren. First airing in March 1999 on ID&T Radio (the predecessor of Slam!FM), the show takes the format of a three hour mix in which he plays new trance music, both promotional and commercially released. Selected tracks are announced during the show in order to help promote new artists and releases. Its radio-show/website combination has proven popular internationally, as fans—while listening to the radio-show—will converse in the website chat-rooms and forums, such as Digitally Imported, during the broadcast. The success of the show has also spawned to include several dance events around the world.