THEY MIGHT BE PIP-SQUEAKS…. The new target audience, that is, for They Might Be Giants, who’ve become official children’s-music artists with their recent album, No! (left). They aren’t the only ones stooping to conquer a shorter demographic. Ex-Del Fuego Dan Zanes’ third disc of juvenile roots-rock, Night Time! (out Oct. 15), includes duets with Aimee Mann, John Doe, and toddler fave Lou Reed. It’s a p.m.-themed concept, but ”not a lullabies record,” Zanes says. ”I was hearing from people that their kids wanted to listen to my music before bedtime, but it was too jumpy. This is more dinner music” — if your small fries like zydeco with their brussels sprouts. Nettwerk’s For the Kids (Nov. 5), meanwhile, features unreleased tracks by Sarah McLachlan and Tom Waits. But are these CDs really for the kids? The lyrics of some of TMBG’s moppet songs, like ”I Am Not Your Broom,” couldn’t be closer to the band’s usual absurdist non sequiturs. ADD pop, it turns out, knows no age barriers.