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You're going to use it many time to when we'll learn to improvise. I suggest you study the form of the blues by heart. The standard harmony of a simple major blues is built of the first, fourth and fifth scale degrees of the major scale: (which is being played in the last four bars) included a conclusion of the first and second line. The second four bars repeated this line to increase the impact and the closing line The first four bars included the first musical line and text introducing the blues theme. Later on the form of the blues became more clear and was treated as a standard scheme of 12 bars and the text and musical structure was being set.
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It wasn't composed but improvised mostly.
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You basically sang what you felt at the moment. The text of the blues was not always so clear. The slaves just sang their heart out without any boundaries. The form of the blues was not solid at first. Yet, the blues could be played in a cheerful vibe as well, and especially with some interesting rhytmic figures which were brought by the African culture. The blues and the blues scale have these characteristics of sadness in their nature, caused by bending some of the notes in the scale. The meaning of "blue" is not completely defined but it has to do with a melancholic or sad feeling. It was their way to express sadness, distress and pain. The blues was first being sung by the slaves who where brought to America from Africa. In order to learn about the 12 bar blues we first have to discuss the development of the blues.
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