Four-note Chords
The chromatic button accordion (CBA) has chord shapes that are the same in any key and a wider range of notes within the span of the hand. The following four chord types and shapes are similar but different. Each chord type has a unique sound.
Major Seventh Chord (Maj7, M(triangle)7)
Root position -- C, E, G, B
Root note, the two notes together in the next row, and finally a note one more row over.
Also play the shape in its various inversions and using alternate rows.
Play the shape in all keys, inversions, and row combinations.
Hear and sing the root of the chord.
In the left hand, play the Major row (fourth row from bottom).
Dominant Seventh Chord (7)
Root position -- C, E, G, Bb
Root note with the other three notes together in the next row.
Also play the shape in its various inversions and using alternate rows.
Play the shape in all keys, inversions, and row combinations.
Hear and sing the root of the chord.
Alternate between the two chords (Maj7, 7, Maj7, 7)
In the left hand, play the Dominant Seventh row (second row from bottom).
Minor Seventh Chord (min7, m7, -7)
Root position -- C, Eb, G, Bb
Root note and second note in same row with the other two notes together in the next row.
Also play the shape in its various inversions and using alternate rows.
Play the shape in all keys, inversions, and row combinations.
Hear and sing the root of the chord.
Alternate between the three chords (Maj7, 7, m7, 7, Maj7, 7, m7, 7)
In the left hand, play the Minor row (third row from bottom).
Half-diminished Seventh Chord ((circle with slash)7)
Root position -- C, Eb, Gb, Bb
Root note and next two notes in same row with the other note in the next row.
Also play the shape in its various inversions and using alternate rows.
Play the shape in all keys, inversions, and row combinations.
Hear and sing the root of the chord.
Alternate between the four chords (Maj7, 7, m7, half-dim 7, m7, 7, Maj7)
In the left hand, play the Root row (fifth row from bottom).
Diminished Seventh Chord (dim7, (circle)7)
Root position -- C, Eb, Gb, A (Bbb)
Root note and all other notes in same row.
Also play the shape in its various inversions and using alternate rows.
Play the shape in all keys, inversions, and row combinations.
Hear and sing the root of the chord.
Alternate between the four chords (Maj7, 7, m7, half-dim 7, dim7, half-dim 7, m7, 7, Maj7)
In the left hand, play the Diminished row (the bottom row).
Example Song -- "All the Things You Are"
Music -- lead sheet
Performance
Jon Persson - All the Things You Are
- Chord Analysis
How to Analyze Chords - Essential Jazz Theory
Jeff Schneider
- Backing Track
All the things you are - Backing Track
https://www.youtube.com/watch?v=iyHDHYrdWPs
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