Hanna-Barbera cartoons may have been video junk food, but the accompanying music was often a feast. Hoyt Curtin's blaring big-band arrangements gave animated heroes such as Quick Draw McGraw a touch of class. Unfortunately, Hanna-Barbera Classics Vol. 1 has a lot of instrumental filler before you get to the meat: ''Yogi Bear,'' ''Meet the Flintstones,'' and (zoicks!) the immortal ''Scooby Doo, Where Are You?'' C

