"'Greatest hits'"? you're thinking. "I didn't know they'd even had one. And they only just turned 13." While it's true that the Olsen twins' music hasn't made a dent in Top 40 radio (or any other kind of radio, outside of children's stations and programs), Mary-Kate and Ashley actually have quite a repertoire of albums to draw from, and their fans have evidently made it known what their favorite MK&A songs are. The duo released its first album in 1992, at age six. It was called BROTHER FOR SALE, and the winsomely lisping, cutely off-key title track is one of those found on MARY-KATE & ASHLEY'S GREATEST HITS. Two more relics from their primary-school days are also included: the title track of follow-up album I AM THE CUTE ONE (the refrain is "I am the cute one, she's just my sister," and it's all in good fun) and "No One Tells the President What to Do." The rest of the album's 16 tracks, though, are taken from more recent Olsen twins music videos, and they reflect the girls' newfound status as adolescents. Bouncy, danceable, all-girl fare like "Meet You at the Mall," "Dare to Dance," "Makeover Machine," and "Fashion Jr. High" abounds -- and as far as parents are concerned, the best thing about it is it's entirely G-rated, unlike so much of what teen and preteen girls hear on the radio these days. So there's a major emphasis on appearance - but the twins try to balance it out with songs like "I'm Still Me" and "Pullin' an All Nighter." Admit it: you'd rather your daughters emulated Mary-Kate and Ashley than Britney and Christina, now wouldn't you?