Piano Chords: How Many Are There?
Why do you suppose is that?
It is probably because it sounds like one of those questions such as "How many grains of sand on the seashore are there?", or "How many stars are there in the sky?"
And in a sense it is, but in another sense, we can get a fairly accurate sense of chord population just by calculating all the chord types and then multiplying them by the number of inversions that are possible and the number of octaves that are possible on any given instrument.
So let's start with a listing of chord types:
Major
Minor
Diminished
Augmented
Diminished 7th
Major 6th
Minor 6th
Major 7th
Minor 7th
Half-diminished 7th
9th
Flat 9th
Sharp 9th
11th
Sharp 11th
Suspension
13th
Sus 7th
Aug 7th
9th/Major 7th
6th/9th
Add 2nd
Add 4th
Flat 5th
7th with flat 5th
That's 25 of the most-used types. There are several other variations, but these chord types will do nicely for our purposes of estimating the total number of chords.
Each chord can be inverted -- turned upside down -- by the number of notes in the chord. For example, a 3 note chord has 3 positions -- root position, first inversion, and second inversion. A 4 note chord has 4 positions, a five note chord has 5 positions, and so on.
We will say for arguments sake that 4 positions is the average, knowing that some chords have more and some have less. So if we multiply 25 chord types by 4 positions, that gives us 100 possible chords per octave.
Some instruments only have the range to play 2 or 3 octaves, whereas a piano with its 88 keys can play 7 octaves -- 100 chords in the lowest octave, 100 chords in the next octave, 100 chords in the next octave, and so on up to the top octave of the keyboard.
So on the piano we could theoretically play those 100 chords in all 7 octaves, giving us 700 possible chords. Of course, some would sound so low or so high that they wouldn't really be useable in a song. But still, they are possible.
So what's the answer to the original question? It depends upon the instrument and how many variations of each chord the individual musician uses.
Related Tags: music, chords, minor chords, piano, piano chord, major chord, 7th chords
Duane Shinn is the author of over 500 music books and music educational materials such as DVD's, CD's, musical games for kids, chord charts, musical software, and piano lesson instructional courses for adults. His book-CD-DVD course titled "How To Dress Up Naked Music On The Piano!" has sold over 100,000 copies around the world. He holds advanced degrees from Southern Oregon University and was the founder of Piano University in Southern Oregon. He is the author of the popular free 101-week online e-mail newsletter titled "Amazing Secrets Of Exciting Piano Chords & Sizzling Chord Progressions" with over 70,000 current subscribers.
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