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A lot of great blues bars/venues are in Chicago. These include:
The smoke daddy and

Blue Chiago!

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Originated by African Americans in the Deep South of the United States around the end of the 19th century. In the late 1800s, America, Abraham Lincoln abolished slavery across the USA. This had a drastic impact on the freedom of pioneers for blues music. Characterized by the blues scale which adds in chromatic notes, specific 12 bar chord progressions and particular chords including 7th and 9th chords. The rhythm is also important emphasizing a shuffle like feel. Blues can be linked to be the main influences of rock  n roll and even jazz. Popular blues guitarists include BB King, Eric Clapton and Stevie Ray Vaughan (SRV)- who can be linked to be the main inspirations for guitarists such as Slash

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considered one of the most influential blues musicians of all time, earning the nickname "The King of the Blues". the guitarist cut his first record in 1949. He spent the next several decades recording and touring, playing more than 300 shows a year. An artist of international renown, King worked with other musicians from rock, pop and country backgrounds. He won his 15th Grammy Award in 2009. B.B. King died in 2015.

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In 1969, he released his biggest hit single, "The Thrill is Gone." King's version is a slow 12 bar blues in B minor in 4/4/time. It was a cover of the Roy Hawkins and Rick Darnell 1951 version. BB Kings version was released as a single in December 1969, becoming one of the biggest hits of his career, appearing in the R&B chart at number three and the Billboard hot 100 and the  pop chart at number 15.The thrill is gone became one of his signature songs. It has lead to many covers including Aretha Franklin.

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B.B. King-The Thrill is Gone with lyrics

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Blues is typically in a harmonic progression of 12 bars in a 4/4 time signature.The blues chords associated to a twelve bar blues are typically a set of three different chords played over the 12-bars. They refer to the degrees of the progression and are usually in roman numerals. For instance, for a blues in the key of C, C is the root (I) and F is the (subdominant IV).

The last chord is the dominant turnaround , marking the transition to the beginning of the next progression.

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https://en.wikipedia.org/wiki/Blues
https://en.wikipedia.org/wiki/B.B._King
https://www.biography.com/people/bb-king-9364839
https://en.wikipedia.org/wiki/The_Thrill_Is_Gone