Several studies have shown the positive correlation between cognitive development and classical music. And, we don’t really need studies to tell us how much kids love their own classics, incuding such hits as Twinkle Twinkle Little Star and Down By the Bay. Why not put them together? Duck, Duck, Moose has done just that, creating a 21-song album called Duck Duck Music, full of kids’ songs classically arranged by musicians from the New England Conservatory, Stanford University, and the San Francisco Chamber Orchestra. Beautiful strings from the violin, viola, and cello combine with drums and vocals to give your kids what might be the best going-to-sleep album ever crafted. Duck Duck Music is available now on iTunes and Amazon for $9.99 and $8.99, respectively.