All progressions

I V vi IV in G: G, D, Em, C

Their roots are the first, fifth, sixth and fourth notes of the G major scale. G, D and C are major chords and Em is a minor chord.

1. G

   I

   G B D

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2. D

   V

   D F# A

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3. Em

   vi

   E G B

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4. C

   IV

   C E G

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I V vi IV in other keys

• C
• Db
• D
• Eb
• E
• F
• F#
• Ab
• A
• Bb
• B