Most known for their rich and retro tone [...] Martin is one of the most famous and long-lasting family-owned brands in American history and easily one of the most influential forces in the guitar industry. The acoustic guitar giant has a legacy that stretches back close to 200 years and is responsible for shaping how everyone else builds and designs acoustic guitars. From popularizing X-bracing to inventing the iconic dreadnought shape, Martin is one of the most important guitar brands to ever exist.