SIGMA JAZZ BAND - nastao je 1991. u okviru Big Banda Bjelovar na tradiciji dixieland bandova. Osim dixielanda band izvodi sve forme jazza kao i mnoge jazz skladbe hrvatskih autora, poglavito članove sastava. Ansambl je dobitnik nagrade na Proljetnoj reviji jazza 1992. u Hrvatskom glazbenom zavodu. Ansambl je nastupao u Belgiji, Francuskoj, Luksemburgu i Sloveniji.

SIGMA JAZZ BAND - was formed in 1991 within the Bjelovar Big Band, evoking the tradition of dixieland bands. Apart from dixieland, the band performs all jazz forms, including the work composed by Croatian authors, the band members in particular. The ensemble is the recipient of the Springtime Jazz Festival prize in 1992, which took place in the Croatian Music Institute in Zagreb. They have performed in Belgium, France, Luxembourg and Slovenia.