Four chords in chord progression. How to choose the fourth chord?

1. What is the fourth chord?
2. What chords can go to IV?
3. What chords are in the 4 chord trick?

What is the fourth chord?

A suspended chord (or sus chord) is a musical chord in which the (major or minor) third is omitted and replaced with a perfect fourth or, less commonly, a major second.

What chords can go to IV?

iv or IV chords lead to i, V, v, vii°, or VII chords. V or v chords lead to i, VI or #vi° chords. VI or #vi° chords lead to i, III, III+, iv, IV, V, v, vii°, or VII chords.

What chords are in the 4 chord trick?

The I–V–vi–IV progression is a common chord progression popular across several genres of music. It involves the I, V, vi, and IV chords of any particular musical scale. For example, in the key of C major, this progression would be: C–G–Am–F.