Definitive was founded in July 2001 , by Firat Öz and Demir Dinmez.After several line-up changes the band performed at many domestic festivals also recorded some stuff which are broadcasted by some radio stations. In June 2005 , Definitive supported 'MEGADETH' at RockIstanbul festival which is one of the biggest festivals in Turkey. Seyhan Sapmaz who was our ex-drummer is replaced with Cagri Halacoglu in August 2005 just before starting to record the "On Fire" Ep.