There are two kinds of critic-proof kids' music albums. The first kind are albums from, say, Barney or the Wiggles or Baby Einstein. Setting aside whatever you (or, more importantly, I) think of the artistic merits of their music (and it's not necessarily what you think), clearly critical opinion won't move the sales meter one iota, up or down. (Note: I'd love to see what Oprah would do with kids' music, though.) The second kind is an album such as this one, Road Trip, the second album from the Boston-area group Girl Authority, released earlier this week. Now, seeing as their first album has reportedly sold more than 100,000 albums -- if not High School Musical-type sales, certainly more than enough to hold their own with the Dan Zanes and Laurie Berkners of the world -- there's something of the first kind of critic-proof-ness in here. But the bigger reason this album is critic-proof is this: Your kids can -- and do -- buy this album. Listen, if every parent who claims to be sick of the Wiggles just stopped buying their CDs, their sales would drop dramatically. Why? Because 3-year-olds aren't walking into their local Target, plunking down their credit card, and buying the latest CD. This album, however, isn't targeted at you (or me). It's targeted at your 9-year-old daughter. Who, while she probably doesn't have a credit card (unless you've got a waaay different approach to parenting than I have), does probably have an allowance and could pick this up at the mall or ask you to get it the next time you order something online. And, let's face it, you're probably not going to listen to the CD very much as she'll listen to it in her room or with headphones on. Still, you (or some well-meaning relative) might be interested in knowing, well, is it any good?