What are chord formulas ? Chord formulas show all the notes which constitute a chord. They reveal the structure of chords. Knowing them will make your guitar playing more interesting. It allows you to make the link between scales, arpeggios and chords. You will be able to build your own chords, to find any chord position on the guitar when you only have the name of a chord, to make the difference between major, minor or diminished chords, to turn quickly a chord into any variation. Learning chord formulas is necessary for anyone who wants to expand its musical knowledge. Here is a chart that lists the main chord formulas.