#1
I have a book that shows A7 one way, whereas a Chord Chart I have shows it another way. The same goes for other chords. Why is this?
#2
because you coulde arrange the notes in a different order and get a different sound they are called voicings btw
#4
all A7 needs are the notes A, C#, E, and G and since the guitar is layed out in a matrix there are tons of ways to make the chord.
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#5
it's called an inversion. one may be more convenient to play in a certain situation
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