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Originally Posted by Bruce Lindfield But you're not answering the question asked!!
So he asked how you worked out that it was all in the key of Ab from just seeing those chords - and I have already given the answer above, a while ago - in that you analyse the function of the chords.
Dominant 7ths are always V chords in a major scale - so you know the Eb is the V and then you can infer all the others from that! |
Think of my answer as aiding and abetting yours. Both of our explanations fail if one starts playing the 2 and 6 chords as dom7ths. You can also look at the circle of 'fourths' that's going on and see the interval between the Abmaj7 and Dbmaj7 and realize that that only occurs in Ab. Which you know.
Sometimes the hard part for beginners is to recognize the intervals, and then be able to separate the sections. I was used to playing long turnarounds when I was taught to separate tunes like "All the Things" into key centers so it immediately made sense. But I don't know how I would have done if I didn't already have a sense of 3 6 2 5 1 in my head.
(for the record...In DIATONIC harmony:
1. The 5 chord is the only dom7 chord.
2. Maj7 only happens on 1 & 4. Watch for that interval.
3.A Maj7 with a Min7 a whole step up can only happen with 1 & 2.
4.A Maj7 with a min7 a half step lower can only happen with 4 & 3
5. A min7 with a Min7 a whole step up can only happen with 2 & 3.)