Extempore, formerly known as Ad Libitum Quartet, is a band located in Vienna, Austria. It consists of Mark Holub on drums, Villy Paraskevopoulos on piano, Vinicius Cajado on double bass and Werner Zangerle on saxophone. The band was formed by Paraskevopoulos for a festival in Graz in 2021 as a trio, after which they became a quartet with varying bass players. Since this year Cajado is the definitve fourth member of the group, himself being an outstanding bass player that is active with many different formations. The group's style can be described as somewhere between European improvised music and American free jazz. Werner Zangerle is a musician and pedagogue living in Vienna.

He plays in many different groups, ranging from Contemporary Jazz via New Music to Big Band sound. Villy Paraskevopoulos was born in Athens, Greece, but has been located in Austria for over twenty years now. His interest lies in Jazz in general, from improv to contemporary classical music. Vinicius Cajado is a Brazilian double bass play