Ricardo -> RE: Chord question (Jan. 2 2011 14:18:41)
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You need to understand that a scale and a 13 chord are the same thing so you have to realize how the notes in a chord are stacked up in thirds. To have a proper chord you need a root, 3rd, and some kind of other note, either 5th, 7th, 9th, 11th, or 13th. (because when stacking intervals we can't use 2,4,6 of the scale, those occur when building chords as "extensions", 9,11,13). So to find the root, stack the notes and discover which is the strongest. the 5th can be missing, but not the ROOT or the 3rd (unless you have a bass instrument playing the root but lets assume you don't). AGCF#C....so ignore the extra C for now. AGCF#....the only 3rd relations are A-C and F#-A. So since A is the bass start with A as the root: ACG (1,b3,b7) which is an Am7 chord (minus the 5th which is almost always ok). The F# note would be the #6th as you would have in a Dorian scale. But the chord we build as 1-3-5-7-9-11-13. So it is Am7-13...and the 7 is redundant or implied so you name it simply Am13. And you have the scale implied as well....A dorian. If I tried to spell the chord with the other third relation.....F#-A...we have a not so strong chord structure:F#-A-C-G....1,b3,b5,b9....so F#m(7)b5b9/A.....a much too complicated name for an inverted Am13, the implied scale is F# locrian (relative of A dorian or G major and B phrygian....a clue to possible flamenco palo). Lower common denominator is usually the way to go, but CONTEXT could change things. Ricardo
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