When you’re a parent, your biggest job is to just let your kid be a kid. And that’s the mission of Barney, the oversized, lovable goofball with the cartoonish voice and big laugh whose generous mandate is to make young’uns giggle. And who wouldn’t giggle with these songs? The congenial, ambling “Boom Boom, Ain’t It Great to Be Crazy” gives you all the permission you need to wild out, while “The Land of Make Believe” sounds like the world’s sweetest play-date invitation.