Cocktail Piano Chords: Diatonic 7ths

Cocktail-Piano-ChordsYour exploration of cocktail piano chords must include the eventual understanding and implementation of diatonic 7th chords. In essence, within a given key, the diatonic system represents the “skeleton” of that key that you are playing in.

What do we mean by “diatonic?” Let’s take a look at the scale of C Major:

C  D  E  F  G  A  B  C

Now, if we build chord structures using 3rd intervals (in other words, playing every other note from left to right) beginning on any given degree of this scale, this will result in playing a 7th chord. For example, starting on C, we would have:

C  E  G  B  (Cmaj7)

Keep in mind that we are adhering to the members of the scale (we are not playing any sharps or flats since the scale of C Major contains none).

As we do the same using D as the root of the chord, we arrive at:

D  F  A  C  (Dmin7)

Again, notice that we have built our chord using 3rd intervals while adhering to the members of the C Major scale.

When we adhere to the members of a given scale as we are doing here, we are playing diatonic chords. These are cocktail piano chords that you will want to have mastery over!

Here are all seven diatonic 7th chords in the key of C Major:

C  E  G  B  (Cmaj7)

D  F  A  C  (Dmin7)

E  G  B  D  (Emin7)

F  A  C  E  (Fmaj7)

G  B  D  F  (G7)

A  C  E  G  (Amin7)

B  D  F  A  (Bmin7b5)

So, you see, we have constructed every possible chord in this fashion within the key of C Major. As you play your favorite standard songs, you will want to take note of the key you are in and pay attention to which of the chords are diatonic.

In order to become more proficient at recognizing these chords within a song, you will want to gain familiarity with each of the scales and the chords that are constructed using the members of these scales.

Take note of the following:

The I chord is a maj7 chord

The II chord is a min7 chord

The III chord is a min7 chord

The IV chord is a maj7 chord

The V chord is a dominant 7 chord

The VI chord is a min7 chord

The VII chord is a min7b5 chord

Since the musical system is mathematically perfect, the same will be true for all the major keys. Although the roots and chords will vary, the qualities of these chords will always remain the same (The I chord will always be a maj7 chord, the II chord will always be a min7 chords, the III chord will always be a min7 chord, etc)

You will want to become familiar with the diatonic 7th chords in all the keys. Not only will this enhance your understanding as to how music is put together, but you will also be able to more efficiently improvise your own musical ideas as you become more and more comfortable with the diatonic system. As a cocktail piano player, this will be conducive to your coming up with some pretty interesting improvisations of your own!







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