Theory: The Ab seventh chord is constructed with a root, a major third An interval consisting of four semitones, a perfect fifth. You can see the four notes of the Ab seventh chord marked in red color. Explanation: The A flat seventh is a dominant four-note chord. chord at the start of bar 7 immediately preceding the cadence in F major. The roman numeral for number 2 is ii, and is used to indicate this is the 2nd chord in the scale. Ab7 chord for piano with keyboard diagram. The B-flat tonic harmony serves as the pivot chord in the modulation to V. So why do we use a flattened 7th in a dominant chord It sounds dissonant. This supertonic 7th chords root / starting note is the 2nd note (or scale degree) of the Bb major scale. But the C-major scale does not contain B. Download GtrLib Chords app to view all the positions of B dominant 7th flat 9th chord on the guitar along with audio demonstration of the chord at each position. The B-flat major chord ii 7 is the C min 7 chord, and contains the notes C, Eb, G, and Bb.
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