YAMAHA was established in 1897 as a company which produced musical instruments originally, but now they produce bike, scooter, boat, marine jet, outboard motor, snowblower and AV system etc, furthermore, pier and pool etc., so this space is too confined to describe all of YAMAHA.  In comparison with YAMAHA, other guitar companies are too tiny as bugs.

Electric guitar division may be most unprofitable department in YAMAHA, but YAMAHA is admirable enough to maintain it over 50 years.  I can say that YAMAHA is one of great company because it has a policy which is independent of profit.

YAMAHA started making representative SG model in 1972.  They maintain it and developing now.

YAMAHA has been making original models only in principle, but in only 70s to the late 80's, they made copy models of Les Paul and Stratocaster.