Ponderosa, a five-man outfit from Atlanta that had some success with 2010’s “Moonlight Revival,” was a revelation. “Revival” mixed the alt-country grit of the Drive-By Truckers with the southern rock of Lynyrd Skynyrd. Friday, however, the band unleashed a sonic attack at the Landor Stage on the Serpentine Wall that mixed the guitars of Kalen Nash and Kris Sampson with John Dance’s stunning keyboard work, Darren Dodd’s relentless drumming and the throbbing bass of Jonathan Thomas Hall on songs from their new album, “Pool Party,” out July 31. If you closed your eyes, there were moments that seemed as if Garbage was sharing the stage with Quicksilver Messenger Service. Is that even possible? See for yourself when the band plays an in-store set at Shake It Records in Northside July 30.