Essential Tremors is something of an anomaly in a city steeped in twang, bathed in sunshine and besieged with hootenannies. Code Knr, Miller, Read Only Memory, Tan, and Eerie Neighbor make up the group voted most likely to trigger a cold sweat, and we love them for it. In the past year, the band has made the charge away from guitar music with a quiet strategy of sporadic shows of crawly, four-track downer violence.