The first slate of performers were released today, and they feature four performers of the folky guitar variety and one post-Britpop band.

Written and photographed by Martin Locraft When listening to Matt Nathanson’s studio albums, one might assume that his live show is typical singer-songwriter – guy with a guitar, a backup musician or two, relatively mellow – but last night’s crowd at the sold-out Sixth and I Historic Synagogue quickly learned that this certainly isn’t the case. The San Francisco native resident, known for maintaining a Storytellers-esque vibe on stage, revealed throughout the evening that he’s…