From 1998 to 2003, pianist Dana Reason played with Stone guest curator Pauline Oliveros and shakuhachi master Philip Gelb in the Space Between, a gorgeously slippery free-improv trio; small wonder that Oliveros tapped Reason to play during her Stone series, which finds the pianist in a duo with drummer Peter Valsamis at 10pm. Up first at 8pm are Curtis Bahn on computer-enhanced sitar and Steve Gorn on bansuri.