Chord progressions
The vi–IV–I–V chord progression
vi–IV–I–V is the I–V–vi–IV loop started on its minor chord, which gives it a more serious, minor-sounding feel. In C major it is Am – F – C – G.
Hear it, then play it
Play each chord in turn: press all of its notes, in any order and any octave, before moving on. The chords are in C major.
Play Am (0 of 4 chords done)
Major or minor?
The chords are those of a major key, but starting and leaning on vi makes the ear hear the relative minor as home. Read in A minor, Am – F – C – G is i–VI–III–VII.
Songs that use it
"Zombie" by The Cranberries loops these four chords (Em – C – G – D, vi–IV–I–V in G major).