Twelve-bar blues

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Arts and letters

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What Wikipedia says

The twelve-bar blues (or blues changes) is one of the most prominent chord progressions in popular music. The blues progression has a distinctive form in lyrics, phrase, chord structure, and duration. In its basic form, it is predominantly based on the I, IV, and V chords of a key.

Excerpt from the Wikipedia article “Twelve-bar blues”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Hyacinth at English Wikipedia, Public domain, via Wikimedia Commons.