Tartar Lamb II and II.5

A satellite of guitarist, composer and conceptualist Toby Driver's avant-garde chamber-metal ensemble Kayo Dot, Tartar Lamb has morphed from an intimate duo with violin into a more rigorous quartet with improvising winds—thus the designation "II" in its name. The group is playing a new four-movement work, Polyimage of Known Exits, presumably meant for its forthcoming album. And special guests are promised—no doubt explaining the "II.5."