Indigo Girls

While they came into prominence as part of the late-'80s folky singer/songwriter revival, The Indigo Girls had staying power where other artists from the same era quickly faded. Their two-women-with-guitars formula may not seem very revolutionary on paper, but the combination of two distinct personalities and songwriting styles provided tension and an interesting balance. Emily Saliers, hailing from the more traditional Joni Mitchell school, had a gentler sound, was more complex musically, and leaned toward the abstract and spiritual. Meanwhile, Amy Ray drew heavily from the singer/songwriter aspects of punk rock, citing influences such as The Jam, The Pretenders, and Hüsker Dü for her more abrasive and direct approach. In a decade-plus of recording, they managed to garner respectable mainstream success and keep their rabid core following.