Throughout time, there have been classic duos: Lenny and Squiggy, Cagney and Lacey, Hall and Oates. The Indigo Girls are no exception. Their pristine and luminary vocal harmonies alone make crowds hoot and holler. Each song has a totally different energy and tension. With their more lighthearted and witty songs, Emily Saliers and Amy Ray play off each other like a comedic duo. Other times, their songwriting and arrangements are so clever, you would think that the two fight crime on ...  [+]