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Blues music is a style of music that originated in the Deep South of the United States in the late 19th and early 20th centuries. It is characterized by its emotional depth and use of specific chord progressions, melancholy lyrics, and a wide range of expressive techniques such as vibrato, growling, and shouting. While it has a simple and raw quality, blues music is also deeply rooted in African-American history and culture, making it a rich and nuanced genre. So, while there are simple aspects to blues music, it is not simple in the conventional sense.