Anyone who doubts that San Diego has become a thriving music center need only head to an Acoustic Alliance showcase for proof. Scheduled to take place Aug. 12 at Brick by Brick, the event features a dozen performers, each offering up their best four songs, plus three more pre-show and intermission acts. Among the highlights this time out will be Tolan Shaw, best known as a member of the indie rock group New Archaic, here in solo troubadour mode, with an arsenal of great folk, pop and rock tunes. Other favorites on the bill include Vanja James, Jeffrey Joe Morin, Ivan Cheong and The Mighty Sun. This show is a great way to see and hear a broad range of local artists in one fell swoop, as well as an excellent opportunity for up-and-coming performers to interact with more established musicians. • Acoustic Alliance takes place beginning at 6 p.m. on Sunday, Aug. 12 at Brick by Brick, 1130 Buenos Ave. 21 and up. $8. www.brickbybrick.com