Thunderdome is a famous concept in hardcore techno and gabber music, and is mainly used for an ongoing series of parties and CD-albums. It is organized by the Dutch entertainment company ID&T. History Before the Thunderdome concept was started ID&T organized a big rave called The Final Exam, that was held on 20 June (1992). This was the first attempt to bring hardcore and gabber to a wide audience and the first event organized by ID&T, who would later go on to organize other big dance music events such as Mystery Land