There’s more to this than the math, of course! Each of those three chords has a definitive sound, and the way they relate to each other is part of what moves the music forward. That this pattern uses the 1, 4, and 5 chords of the key: We’ll see more of this in just a moment, but for right now just recognize that the term “1-4-5 progression” is used to mean Musicians use these numbers as shorthand to communicate chord changes. We’re in the key of G, so if we number the letters of the G scale then we could call G the “1 chord”, C the “4 chord”, and D the “5 chord”. The “12 bar” part should be pretty clear: three lines of four bars each. Here is an example of a 12 bar blues form in The 12 bar blues is sometimes called a “1-4-5 progression” because of the chords it generally includes. Just a little music theory before we go forward. So much so that an experienced player can walk into a blues jam anywhere in the world and be able to play along even if they don’t know the songs. There are forms that we might think of as “standard”, that show up so often in the same way that you can anticipate what the chords will be and when they’re likely to change. Form won’t necessarily tell you what the chords to a song will be, but it does give you the sections and how long each one lasts. “Form” in music is a framework, a basic outline of the song. Including rock, country, gospel, bluegrass, and folk. Though it comes from the blues, the chord structure of the 12 bar form can be heard in any style with a blues influence The 12 bar blues form is one of the most common song structures in music.
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