The most common chord progression you see is typically the 1-4-5. This is a formula for music called the Nashville Number system. It's really quite simple.It is based on the positions of the notes of musical scales.
For example, the scale of G is: G A B C D E F# G Here is that scale with the position numbers of the notes: 1 2 3 4 5 6 7 8 G A B C D E F# G In the key of G this is what the Chords of the scale would be. 1 2 3 4 5 6 7 8 G Am Bm C D Em F#dim G This is why you will see a song in the key of G having G, C, and D (or variations of those chords) played frequently. The chords in this progression will change depending on the key, but the 1-4-5 always stays the same.
A 12-bar in the key of G could look like this. G (1) C (4) Gx2 (1) Cx2 (4) Gx2 (1) D (5) C (4) G (1) C (4) G (1) D (5) Hope this helps ya. Feel free to ask questions.
I'm not always the best at explaining these things.
Overwhelmingly, the most popular chord progression is the I-IV-V chord progression (sometimes, the V is replaced with a V7). For the key of A, this translates to A-D-E (or A-D-E7).
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