Bluegrass music is a form of music that incorporates some elements of country, folk, jazz, and of course blues, and is usually played on acoustic stringed instruments.

Although it is influenced by Scottish and Irish folk music, bluegrass music is an American form of music. The name "bluegrass" comes from the band name, the Blue Grass Boys, whose singer, Bill Monroe, is considered the founder of bluegrass music.

Bill Monroe and the Blue Grass Boys became popular in the 1940s. Their group featured instruments such as the banjo, the mandolin, and two fiddles. The most recognized outlet for bluegrass music was the Coen Brother's film, O Brother Where Art Thou?, released in 2000. The film, which starred George Clooney, featured the actor and his prison friends as a bluegrass music band called the Soggy Bottom Boys. 

In recent years, several modern country music artists have recorded bluegrass music albums.

This has come particularly since the release of O Brother Where Art Thou? Since this movie bluegrass music has increased significantly in popularity and had become a major presence in American musical culture.

Today, bluegrass bands and concerts can be found in every state in America.