The Peabody Computer Music Consort 5:00pm Corcoran Gallery of Art 500 17th St. NW, Washington, D.C. $12, $8 for members Ruckamuck   Mark Wingate / Christopher Theophanides Nightfall: The Lookout   McGregor Boyle Kelly Boyle, EWI Nocturnes   Geoffrey Wright Catherine Keem, soprano Landfall II: Flaming Skull   McGregor Boyle McGregor Boyle, MIDI Guitar "...does the spring come to a lost land..."   Charles Kim Hyuna Yu, soprano