minor adjustments which are made by ear. The training of guitar technicians varies widely. Some guitar technicians have studied music, guitar repair, amplifier maintenance, or electronics repair in college or university. On the other hand, some techs learned these skills informally on the job, or by working their way up through the ranks in a range of musical jobs, from a roadie and sound engineer to a sideman in a bar band. Guitar techs trained on the job may learn their skills by playing in amateur or semi-professional bands as a guitarist or bassist, working for music stores as a guitar repairperson, for clubs or bars as a sound engineer, or by maintaining equipment for PA system rental companies. A typical career path for becoming a guitar technician via on the job training is to begin by volunteering in a bar band and then working for low wages in a regional touring act or a minor touring act. As they gain experience and add skills, they may seek out better-paying jobs with higher-status touring bands. Once a guitar technician has joined the road crew of a major touring act, they may seek out promotions within this organization, to jobs with greater responsibilities and higher pay. For example, a guitar tech who works as an assistant technician could try to get promoted to a guitar technician for the lead guitarist. A guitar tech who completes a guitar repair program at a college or lutherie school may be able to enter midway up the guitar tech career ladder. In the early part of a guitar tech's career, there might be a great deal of mobility between different types of bands and technician roles. While working for minor or regional acts, a guitar tech may be able to work for a country rock bar band and then immediately switch to being the bass tech for a hard rock tribute band, because the tasks are fairly uniform. Career mobility of guitar technicians tends to become more constrained, though, when guitar techs begin to get jobs with high-status professional touring acts from specific genres. When a regional bar band looks for a guitar tech for a summer nightclub tour, there may many guitar techs who could meet the skill requirements. However, if an internationally known 1960s-style acid rock touring act with a celebrity lead guitarist goes on a major tour, there may be only a