Marshall Peterson knew he felt the most alive in foreign cultures, so a decade ago the Seattle schoolteacher caught a ride south and went to Mexico, not sure what he’d find. He took a little digital camera to document whatever it was. Recently, he found himself back in his hometown of Spokane at the opening of an exhibition of concert photographs he made in Guadalajara, where he stopped and stayed. He worked for rock bands to document performances, fans, the scenes behind the scenes – striving to show the whole picture, he said, of a time of change in Mexico’s “cuna del rock,” or cradle of rock.