It's absurd that ''kids' music'' gets filed separately from, y'know, ''real music.'' For parents wanting to ball-gag Barney and remove Raffi's tongue, here are two CDs they might actually replay after the kids are asleep. Zanes used to front roots-punks the Del Fuegos but has since built a cottage industry performing folk-style for tykes and their escorts. His latest convenes unlikely guests to prove good songs don't card you at the door: Among other artists, Bob Weir hitches a ride on ''Wabash Cannonball'' and Deborah Harry gives ''Waltzing Matilda'' a spin. Fair reissues an endearing folk set that Zanes counts among his fave family LPs. It's not all sugarcoated: Damsels die and herring eyes wind up in pies. But that's life, kids. MINIMALISM FOR BEGINNERS Because repetition is a virtue in both nursery rhymes and concert halls, composer Philip Glass adds loopiness to ''Party'''s beautiful ''A Place for Us.''