With their soulful four-part harmonies, poetic lyrics and indelible melodies, it's easy to see why the Atlanta Journal Constitution would hail von Grey as "nothing short of stunning." They sound like they were born to play together - and, in fact, they were. The four sisters have been playing music nearly their entire lives. Classically trained from an early age, the Atlanta-based quartet - Kathryn, Annika, Fiona and Petra von Grey - have built on that foundation by performing upwards of 200 shows in the past two years, from recurring residency tours at intimate venues throughout the southeastern U.S. to supporting gigs with such artists as Sarah McLachlan. Tickets: $15 adults, $12 GEM members & $8 students; on sale July 31 at www.calhoungem.org, (706) 625-3132 and at the GEM box office open Tuesday, Thursday, Saturday 10 a.m. - 1 p.m. and Wednesday, Thursday, Friday 3 p.m. - 6 p.m.