Last night Feist played "How Come You Never Go There" from her gorgeous new album Metals on the Late Show With David Letterman. The night before, she serenaded 100 lucky fans in the crypt of a Harlem church. But the Canadian singer/songwriter saved some of her best performances for an exclusive Yahoo! set you can now watch right here! The ridiculously tight harmonies come courtesy of folk group Mountain Man, who will be touring with Leslie this fall. These clips are so fantastic, if you don't like them, The Amp isn't sure we can really be friends anymore.