by Erik Thiede on August 11, 2010
As the name suggest, extended piano chords extend beyond the range of the major scale. Recall that chords are created with respect to there corresponding scales. For example, the major scale of “G” has this 8-note sequence: G,A,B,C,D,E,F#,G.
Chords that require notes beyond the 8th note (e.g. the last “G”) are extended piano chords.
The 9th, 11th and 13th chords are extended chords and are very popular in jazz music.
Click Here And Learn To Differentiate Extended Piano Chords From The Regular Kind!
Noticed that the notes are displayed on both the treble and bass staffs for these chords. This is because these chords generally require both hands to play them.
Ninth Chords:
The ninth chord is just like the seventh plus the 9th note from the root (counting the root itself).

Eleventh Chords:
The eleventh chord is just like the ninth plus the 11th note from the root (counting the root itself).

Thirteenth Chords:
The thirteenth chord is just like the eleventh plus the 13th note from the root (counting the root itself).

Click Here And Learn To Differentiate Extended Piano Chords From The Regular Kind!
by Erik Thiede on August 10, 2010
Seventh piano chords are just like the triad chords PLUS the 7th note in the scale. It’s used a lot in jazz, gospel and blues piano music.

Just like with the triads, seventh piano chords can have several forms:
Click Here To Get The Lowdown On Seventh Piano Chords!
Dominant Seventh:
Symbol: 7
The dominant seventh consist of the 1st, 3rd, 5th and lowered 7th notes in the scale.
Example: C7 = C E G Bb
Major Seventh:
Symbol: M7 or maj7
The major seventh is a major triad chord plus the unlowered 7th note.
t consist of the 1st, 3rd, 5th and 7th notes in a scale.
Example: Cmaj7 or CM7 = C E G B
Minor Seventh:
Symbol: m7
The minor seventh chord is the minor triad chord plus the dominant 7th.
It consist of the 1st, lowered 3rd, 5th and lowered 7th notes in the scale.
Example: Cm7 = C Eb G Bb
Minor/ Major Seventh:
Symbol: m/M7 or m/maj7
Can decide between the minor seventh and part major seventh? Then the minor/ major seventh chord may be your solution. It’s part minor seventh and part major seventh.
It consist of the 1st, lowered 3rd, 5th and 7th notes in the scale.
Example: Cm/M7 or Cm/maj7 = C Eb G B
Diminished Seventh:
Symbol: dim7
Just like the name suggest, a diminished triad chord is a minor seventh chord with the last note diminished or lowered one-half step. Since the 7th note is already lower by definition, the 7th note is double lowered to become diminished (double flat, 
). The 5th note is also lowered.
It consist of the 1st, lowered 3rd, lowered 5th and double-lowered 7th notes in the scale.
Example: Cdim7 = C Eb G Bbb
Diminished Minor Seventh or Minor Seventh Flat Five or Half-Diminished Seventh:
Symbol: m7b5
It’s like a diminished seventh chord but the 7th note is only half-diminished, it’s just lowered once not twice as is the case in a Diminished Seventh.
It consist of the 1st, lowered 3rd, lowered 5th and lowered 7th notes in the scale.
Example: Cm7b5 = C Eb Gb Bb
Dominant Seventh Flat 5:
Symbol: 7b5
Just like the name suggest, it’s a dominant seventh where the 5th note is flat in the scale.
It consist of the 1st, 3rd, lowered 5th and lower 7th notes.
Example: C7#5 = C E Gb Bb
Augmented Dominant Seventh or Dominant Seventh Sharp 5:
Symbol: 7#5
Just like the name suggest, it’s a dominant seventh where the 5th note is sharp in the scale.
It consist of the 1st, 3rd, raised 5th and lower 7th notes.
Example: C7#5 = C E G# Bb
Play around with all of these seventh piano chords and learn to recognize them in your favorite music.
Click Here To Get The Lowdown On Seventh Piano Chords!