The word "blues" originated from the 17th century and was originally used to describe a state of melancholy or depression. The musical style of blues emerged in the late 19th century and became popular among African Americans in the southern United States. Blues music is characterized by its simple, repetitive structures and melancholy tonality with flatted thirds and sevenths. The term "blues" has since been used to refer to this musical style, as well as to a general feeling of sadness or melancholy.
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