Since chords (the main component of harmony) are one of the three most vital elements of music-the others being melody and rhythm – it would be useful to know how many agreements exist. And it does not matter if you play the piano or guitar or some other instrument agreements are agreements.
ITA certainly not necessary to learn all the agreements in the wide world, but it is necessary to teach some of them-in least enough to allow you to harmonize the songs you want to play.
But meanwhile, there are 3 Chords – just 3 – that you absolutely, positively have to know. If you do not know these three, there is hardly a song in the whole world that you could play. But knowing just 3 chords, you can play hundreds if not thousands of songs! And those chords are simply the basic chords in a given key:
A • I agree (the agreement built on the 1st degree of the scale)
 • The IV chord (the chord built on the 4th degree of the scale)
 • The V chord (the chord built on the 5th degree of the scale)
For example, if you play in the key of C, the rope, I would C (c, e, g), the IV chord would be F (f, a, c), and the V chord would be G (G, B, D).
But as you probably know, there are thousands of other agreements, it would be useful to know at least their existence and maybe get them one days.
So here goes:
Since there are 12 major keys, can play (not counting enharmonic keys  keys that sound the same but are written differently), there are:
* 12 major chords (a triad is an agreement of 3 notes)
* 12 Minor Triads
* 12 diminished triads
* 12 augmented triads
* 12 diminished 7th chords (4 note agreements)
* 12 major 6th chords
* 12 minor 6th chords
* 12 dominant 7th chords
* 12 major 7th chords
* 12 minor chords 7th
* 12 half-diminished chords
* 12 9th chords
* 12 flat 9th String
* 12 9th/major 7th chords
* 12 9th/minor 7th chords
* 12 agreements 11th
String * 12 13
* 12 suspensions
* 12 flat 5th agreements
* 12 maj 7th Flat 5th String
If the agreement does not thats for you, remember that each agreement can be reversed upside down. So multiply all the triad agreements by 3, and all the strings 4 Note 4, and all the strings 5 Rating 5Â ….
Then there are:
A poly-· chord in chords that combine two or more other agreements, and
  Voicings · the strings are so agreements how many actually:
More than you can count.
But again, you donÂ't know them all. Just master enough so that you can play the songs you want to play, then gradually over time learn agreements more. Your musical world will continue to grow and mature as a musician will become obvious to others.
Duane Shinn is the author of over 500 music courses for adults. His low-cost CD ROM software titled “Duane ShinnÂ’s Instant Piano Chord Finder Chart!” is used by musicians around the world. He is also the author of the popular free 101-week online e-mail newsletter titled “Amazing Secrets Of Exciting Piano Chords & Sizzling Chord Progressions” with over 60,000 current subscribers.
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