The 12-string acoustic guitar gained popularity in the early 20th century, offering a richer, more resonant tone due to its doubled strings. It has been a staple in folk, rock, and country, with players like Gordon Lightfoot and Jimmy Page bringing its shimmering sound to the forefront. Notable models include the Guild F-512, Taylor 150e, and Martin D12-28. These guitars are commonly used for rhythm playing, adding depth and texture to recordings and live performances but require more finger strength and careful tuning due to the extra strings.