Related Information for Karen Mantler Karen Mantler (born 1966) is an American jazz musician and composer. She is the daughter of Carla Bley and Michael Mantler.Mantler appeared on the album Escalator Over the Hill as a child, which featured both her parents. She learned glockenspiel and was a member of her mother's band from 1977 to 1980. She studied organ and piano at the Berklee College of Music. In 1987 she formed her own ensemble for recording; she has released several discs of material, including two on ECM, since.. read more