A reclusive songwriter with a chameleonic, regenerative quality, George Montgomery Dallas Davis is known more for shedding his skin than tattooing his intentions to his sleeve. Just as likely to be spotted on a Greek isle or skid row, Davis has never stepped foot on stage, but reliably churns out new song cycles every seven years, each time signing a new lease on the next season of his sketchy, nomadic biography. Davis was last spotted on a North Shore boardwalk hawking caricatures for $10 a pop.