The 12-bar blues structure is the most well-known blues form, comprising four sections, each consisting of three bars. The typical sequence begins on the tonic chord, followed by two bars on a subdominant chord, two bars on a dominant chord, two bars on the subdominant chord again, one bar on the dominant chord, and finally one bar on the tonic chord. This arrangement sets the stage for songs like "Key to the Highway," which adheres to the standardized 12-bar structure.
Bluesstrukturen also encompass other variants, such as the 1-4-5 progression, which shares its core components with the 12-bar blues. These structures frequently inhabit a minor key, as much of the blues repertoire focuses on expressing the hardships of life. Also notable are regional and subcultural performances, party or functional songs and American or, more globally, musical social community methods of feeling included in these styles.
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