If your last music purchase was a Cat Stevens album (what's an album, Mom?) You need to visit Newbury Comics, a music store that the young and the merely groovy will find cool. It carries alternative, pop, and rock CD's, cassettes, and albums. Older kids will enjoy spending their babysitting money on T-shirts, cosmetics, jewelry and other trendy items. Parents beware: Plug your ears on entering the store. You'll be greeted by a wall of music, played most likely by a band you've never heard of, set on ear-shattering volume.