Krieger learned to play guitar when he attended the Menlo School (a boarding school in the San Francisco Bay area). He started by tuning a ukulele like the bottom four strings of a guitar and imitating a flamenco guitar record. Later he purchased a flamenco guitar on a Christmas vacation in Puerto Vallarta in 1963 and mastered the style without benefit of lessons. He gradually grew tired of playing flamenco guitar and helped form a jug band called the Back Bay Chamberpot Terriers with Bill Wolff (later of the Peanut Butter Conspiracy).
These are videos from concerts where Robbie Krieger played, so they may be of other bands that played the concert as well.
Farm Aid Sep 22, 1985 Champaign, Illinois, United States Added by Concert Archives