Rock the Cradle is a streaming radio service "for kids and their grown ups" put out by Minnesota Public Radio. "Rock The Cradle offers the best music for kids and adults to enjoy together: Sesame Street to the Rolling Stones, Bunny Clogs to the Beach Boys, Laurie Berkner to Belle and Sebastian. Great kids music brought to you by The Current."
I know that in theory I can put any streaming radio station on a card, but finding the URL is beyond my technical capabilities, though I've spent a few hours trying. I'd love to see more English language radio stations offered through the app, and Rock the Cradle in particular.