Yodel-Ay-Ee-Oooo is the first book to address the question: How did a centuries-old, Swiss mountain tradition make its way into American country music? Along the way, the reader discovers that yodeling is not just a Swiss thing--everyone from Central African pygmies, Nashville hunks-in-hats, avant-garde tonsil-twisters like Meredith Monk, hiphop stars De La Soul, and pop stars like Jewel have been known to kick back and release a yodeling refrain...