We've all heard of huge music festivals such as Music Midtown and Bonnaroo. One you may not be as familiar with is the ATLANTIS MUSIC CONFERENCE AND FESTIVAL. This four-day festival aims to help independent artists – 95 percent of the acts are unsigned – and features shows at venues from the Loft to the Masquerade to Apache Cafe. The diverse list of performers, including April Hill and Matt Costa, range from rock to power-pop, singer/songwriters to punk and hip-hop. Through Sept. 20. Free-$30. See website for times and locations. www.atlantismusic.com.