The music of the United States reflects the country's multi-ethnic population through a diverse array of styles. Among the country's most internationally-renowned genres are hip hop , blues , country , rhythm and blues , jazz , barbershop , pop , techno , and rock and roll . After Japan, the United States has the world's second largest music market with a total retail value of 3,635.2 million dollars in 2010 [ 1 ] and its music is heard around the world. Since the beginning of the 20th century, some forms of American popular music have gained a near global audience. [ 2 ] Native Americans were the earliest inhabitants of the land that is today known as the United States and played its first music. Beginning in the 17th century, immigrants from the United Kingdom, Ireland, Spain, Germany and France began arriving in large numbers, bringing with them new styles and instruments.
Typical boogie woogie bassline on 12 bar blues progression in C, chord roots in red. The 12-bar blues or blues changes are one of the most popular chord progressions in popular music . The blues progression has a distinctive form in lyrics and phrase and chord structure and duration . It is, at its most basic, based on the I - IV - V chords of a key.