Scotland's Tannahill Weavers kick up a Celtic wall of sound. Blending traditional Scottish airs with a rock 'n' roll attitude, and a healthy sense of humor, the quintet brings a roomful of equipment to bang, tootle, squeeze and strum. Guitars, banjo, mandolin, fiddle, whistles, flute, bodhran, bouzouki, keyboards, harmonica and of course, bagpipes are the bricks in the sound wall. But since the lyrics and the introductions to the songs, and the songs themselves, are delivered in a brogue thick as fog on the moors, you might need a dictionary to untangle the dialect once the show starts. If a band member asks you if the kelterin' kimmers are roarin fu', he's not inquiring if the hot dogs are ready, he wants to know if the undulating young women in your party are extremely drunk. But even if you don't speak the language, you can still enjoy the band's rock star antics. Lead guitarist Roy Gullane has been known to take a bow to the guitar in the best Led Zep tradition, and Les Wilson frequently puts down his bouzouki to fling himself about on the synthesizer like unto a Scottish Stevie Wonder. If you think Scottish music is for scaring the dogs or nodding off by the fire with a bucket of warm suds, The Tannahill Weavers will change your attitude. A word of caution--the Weavers' music has been known to effect drastic changes in the male psyche. Explaining to your friends and co-workers why you've suddenly started wearing a skirt to work and dancing a jig during meetings is your problem. 8 p.m. 929-2787 for information. $12-$15.