The Marcy and Zina Show was a sold-out hit at Signature Theatre's 2010 Sizzlin' Summer Cabaret series. So the pair -- Marcy Heisler and Zina Goldrich -- return to the Arlington theater to offer their electic mix of witty, romantic and sophisticated songs. Tonight, Tuesday, Aug. 16, through Saturday, Aug. 20, at 8:30 p.m. Signature Theatre, 4200 Campbell Ave., Arlington. Tickets are $35. Call 703-820-9771 or visit signature-theatre.org for a complete schedule.