On Gueuledeloup, pianist Achim Kaufmann again collaborates with Michael Moore on reeds and John Hollenbeck on drums and percussion. The addition of Henning Sieverts on bass and cello suggests, at first glance, a turn toward more conventional quartet instrumentation. The music is quite adventurous, however. Kaufmann creates avant-jazz of a spacious and dissonant-yet-melodic sort, full of complex and angular lines and rhythms. Moore's clarinet and Sieverts' arco work tend to give the music a contemporary classical flavor. Hollenbeck's timbral inventiveness -- with mallets, glockenspiel, and other subtle effects as well as drums -- is a tremendous asset.