Celebrity-penned picture books don’t generally inspire much enthusiasm among young listeners. Although the “authors” may be well known to adults, children care more about content. And in many cases, talent in one field doesn’t necessarily imply ability in another. There are exceptions, of course, but unfortunately this rambling first-person narrative won’t be one of them. Obviously intended to cash in on both the author’s comedy routines and the popularity of books that build self-esteem and celebrate diversity, the overly long text fails to entertain or enlighten. The plot is predictable: A mariachi band made up of school children enters a Battle of the Bands, flirts with changing their presentation to resemble the competing rock bands but ultimately decides to stick to their own style. They win, of course. The cartoon-style illustrations are appealing though somewhat static. Outlandish outfits and exaggerated expressions add humor, but the pictures aren’t engaging enough to make up for the forgettable text. Well meant, perhaps, but sadly not “groovanova.” (Picture book. 4-8)