A trio of extreme cellists has played on the roofs of England's cathedrals and while running a marathon. Now they're in the midst of a new challenge — for charity — walking coast to coast, offering mini-concerts for anybody who's around — be it a passerby or a grazing cow.
RENEE MONTAGNE, Host:
Good morning. I'm Renee Montagne.
MONTAGNE: It's MORNING EDITION.
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