Kreyson is a Czech metal band founded in Prague in 1989 by Ladislav Křížek after leaving the band Citron. He was joined by Jaroslav Bartoň, also from Citron, Daniel Krob (Arakain), Robert Vondrovic (Arakain), and Karel Adam (Moped).

Arakain is a Czech heavy metal band founded in Prague in 1982 by former members of the band Apad, whose vocalist, Aleš Brichta, became the frontman of the new project and remained with the band until 2002. The other founding members were guitarist Jiří Urban and drummer Miroslav Nedvěd. After Brichta's departure, Petr Kolář took over vocal duties, and was in turn replaced by Jan Toužimský in 2005. The band's lineup has changed multiple times since its inception, and the only remaining original member is guitarist Jiří Urban. Arakain are considered to be one of the most influential Czech metal bands.