Decatur's dynamic duo, the INDIGO GIRLS, play Chastain SEPT. 10. In case you haven't been following the pair, not only has Amy Ray's sophomore solo album, Prom, enjoyed mass critical praise, the Indigo Girls have finished their major-label contract with Epic Records. So, for the first time since 1988, the ladies are label-less. Future plans include putting out an album in March, even if they foot the bill themselves. $28.50-$38.50. 8 p.m. 4469 Stella Drive. 404-249-6400. www.atlantaconcerts.com.