The Prol'inee By RENEE DORUYTER Music Critic A word often used to describe saxophonist John Zorn is "enig­ ma tic," probably because he appears to be personally shy and retiring. As a musician, however, he is easily accessible - at least he was the last two nights as part of the Sonny Clark Memorial Quar­ tet at the Landmark. tonight at 8 promises to be a totally different experience. Two guitars, two percussionists and two keyboards, and you should expect the unexpected. Free concerts begin tonight at 6 at the B.C. Complex and continue through Sunday evening. Special His band, Xu Feng, appearing at treats to look for at the Plaza of Vancouver East Cultural Centre Nations include Reflexionen, (7 Friday, July 3, 1987 51 p.m. tonight, noon tomorrow and 8 p.m. Sunday); Mr. Toad's Wild Ride (8 p.m. tonight); Vinny Golia Ensemble (7 p.m. Sunday). At Waves, check out the Bob Murphy Quartet (7 p.m. tonight), Kenny Colman (8 p.m. tomorrow), and Philippe Lapointe (noon Sun­ day). At the Waterfront Stage, look for the Shuffle Demons (4 p.m. tomorrow and Sunday), Eugene Chadbourne (3 p.m.) and Lunar Adventures (7 p.m.) Sunday.