Ab Major 6th (Ab6)
Also written as G# Major 6th (G# and Ab are the same key).
Notes in Ab Major 6th
Inversions
Same notes as Ab Major 6th, with a different chord tone as the lowest note. Useful for smoother movement between chords instead of jumping around the keyboard.
Root position
G# in the bass
1st inversion
B# in the bass (Ab6/B#)
2nd inversion
D# in the bass (Ab6/D#)
3rd inversion
E# in the bass (Ab6/E#)
Open voicings
A close-position chord like Ab Major 6th can sound cluttered in the middle of the keyboard. Jazz players open it up by dropping one note down an octave, spreading the same notes wider without changing the chord.
Drop 2
D# on the bottom
Drop 3
B# on the bottom
Ab Major 6th is built from G#, B#, D# and E#.
A major triad with a sixth on top has a warm, slightly old-fashioned charm that was everywhere in swing-era jazz and still turns up whenever a song wants to land on a major chord without the sharper pull of a seventh. It shares three notes with the relative minor's seventh chord, so train your ear to catch the difference.