Georgia folk-rock duo The Indigo Girls' self-titled second album was a minor hit in 1989, but it was their fourth, 1992's Swamp Ophelia, that brought widespread success, with its inventive, revealing wordplay that set the stage for the success of ‘90s singer-songwriters like Jewel and Sheryl Crow. Releasing a string of critically lauded albums in the late ‘90s and the '00s, The Indigo Girls developed a passionate worldwide fanbase, and over their long, prolific career, have inspired everyone from The Dixie Chicks to P!NK with their political activism and rich harmonies.