You can use the shapes of the minor7 chord as a rootless Maj9 chord. The 7th of a minor7 chord becomes the 9th of a rootless Maj9. These are good for comping with a bass player who will cover the root. ![]()
Here is a chart of different "shell voicings" -- intervals you can use as short hand "comp" chords. They are much faster to finger than those three and four finger chords and allow the soloist greater leeway in the harmony. The third and seventh are the "essential tones" or "guide tones" in the changes. Other tones can be guide tones also, like 9ths, 11ths, 13ths or even sharp or flat fives, but the third and seventh are the core of what sets each chord apart. Since major seventh, minor seventh and dominant chords all have a root and perfect fifth, the seventh and the third are really what differentiate them. These two notes, the third and seventh, are really "intervals" since a chord requires three tones minimum. Since the bassist is responsible for voicing the root, the the rhythm section will fully outline the harmony for the listener. This chart has a range of these "shell voicings" to play. If you have to comp for a bar of A-7, you just find an A, which is represented as the white dot. You then find the nearest flat 3rd and flat 7th and play only those notes to comp for that bar. Going from a 2 to a 5 is easy with these voicings. When you move a minor seventh down a semi-tone, you will be on the third of the progression's V7 chord. The minor third of your two voicing will turn into the minor seventh of the V7. Just by moving one finger, you can change from a ii- to a V7. ![]()
Here is another article on shell voicings using triads: http://www.jazzguitar.be/jazz_guitar_chords_basic_shell.html
Here is a link to some flashcards to quiz you on the 3rd and 7th of maj7, mi7 and dom7 chords. |
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