The diagrams below show all of the suspended fourth (sus4) chords. (Such chords are often just called suspended, or "sus" chords.) Use notes 1 - 4 - 5 in a particular key to create the chords. In other words, form a major chord, then replace the third with a fourth. For an explanation of the figures, go to the notation file. To understand how the chords are derived, go to the tutorial on keys. Table 3 is a quick summary of how chords are formed, and Table 2 contains all the notes in all of the (major) keys. Note -- if you know all of the suspended fourth chords, you also know all of the suspended second (sus2) chords. See the figures.