DUO VELJAK - HALLER djeluje od 1995. Na repertoaru su mu djela iz svih glazbenih epoha. Održao je brojne uspješne koncerte. Oba člana bave se i pedagoškim radom.

VELJAK-HALLER DUO - was formed in 1995. Its repertoire consists of works from all periods. The duo had many successful concerts, while both members have been involved with educational activities.