This is an E chord, ok so far-
E--0
B--0
G--1
D--2
A--2
E--0
and to make an E7, all you have to do is play the D string open - but I've also seen an E7 tabbed thus:
E--0
B--3
G--1
D--2
A--2
E--0
so the question is, by adding the D - the 7th note in the scale of E - to the B string, is it necessary to revert back to playing the D string at the 2nd fret or can it be left open? and if so is this a different chord?
:?:
"Sometimes the beauty of music can help us all find strength to deal with all the curves life can throw us." (D. Hodge.)
Chords are made up of specific scale tones; for E7, the required notes are E-G#-B-D, the 1st, 3rd, 5th, and b7th notes of the E major scale.
If you fret the D on both the 2nd and 4th strings, you get this:
0 = E
3 = D
1 = G#
0 = D
2 = B
0 = E
Since you've still got each required tone at least once (and no 'extra' tones), it's still an E7.
There are hundreds of ways to finger individual chords - the differences in the fingerings are called 'voicings'.
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Sorry, a gremlin got in there - it should've read "by adding D - the b7th note in the scale of E" - but the little b got lost!
:oops:
"Sometimes the beauty of music can help us all find strength to deal with all the curves life can throw us." (D. Hodge.)
Like Noteboat said, an E7 with 2 D's and an E7 with 2 B's are just different voicings of an E7 chord. You can double (or triple) any note in the chord when you play a guitar chord. The root often gets tripled when you play any chord that has its bass note on the 6th string. E.G.F,etc.
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