Parents, prepare to throw your prejudices about children's music out the window. The third release from the Backyardigans achieves the unthinkable, using children's voices without sounding precious or overly precocious, and making upbeat dance music that -- dare we say it? -- has some depth to it. (If you don't believe us, listen to "Go, Go, Go" right now.) In a few words: Alicia Keys, highlife, soukous, Cajun and Hawaiian music, doo-wop, and Tex-Mex. About a third of the songs come from their pirate movie; the rest are from the show.