Chicago in the ’50s was overflowing with skilled bluesmen, vocal groups, gospel singers, not to mention the mom-and-pop labels eager to make a hit off the artists. There are the now-famous labels – Chess, Delmark, and Vee-Jay among them. But the Windy City was so teeming with talent (and entrepreneurial hucksters trying to launch their own careers) that small, independent labels were plentiful. Earwig Music Company celebrates one such label in its ambitious new box set, Cadillac Baby’s Bea & Baby Records: The Definitive Collection. It’s not too far-fetched to say the…