In the 17th century, the guitar began to spread to other parts of Europe and the Americas. The shape of the guitar began to change, with the waist becoming more pronounced and the neck becoming longer. The number of strings also increased, with six strings becoming the standard.
By the 19th century, the acoustic guitar had become a popular instrument in folk, blues, and country music. In the 20th century, the acoustic guitar was used in a wide variety of musical genres, including rock, pop, and jazz.
Today, the acoustic guitar remains a popular instrument for both solo and ensemble playing. It is a versatile instrument that can be used in a variety of musical settings.