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10. Emily Saliers and Amy Ray
Talk about a harmonious friendship. These two singer-songwriters, better known as The Indigo Girls, have been making beautiful music together at folk festivals and concert venues across the world for years. Bonding as grade school pals, they took their act on the road in 1981 and have been riding a wave of never-quite-mainstream success ever since. And that's just the way they like it.