Western

Western music originated as a form of folk music. Originally composed by and about the people who settled and worked throughout the Western United States and Western Canada. Directly related musically to old English, Scottish, and Irish folk ballads, Western music celebrates the life of the cowboy on the open ranges and prairies of Western North America.[1] The Mexican music of the American Southwest also influenced the development of this genre. Western music was associated with country music only because of Billboard chart classification. For the artists that wrote and performed Western music, this association as a sub-genre of country music is erroneous. Western music shows no historical origination with the music that came from the southeastern parts of the United States (e.g. Appalachia).

Source : http://en.wikipedia.org/wiki/Western_music_(North_America)