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Converting A to Ao (diminished)
Here is how you
could make an A diminished arpeggio. An A major chord is A(1), C (3),
and E(5). An A diminished is A(1), C( 3),
and E ( 5).
|
A
|---|---|-C |---| -1st string
|---|---|---|-A-|
|-C |---|---|-E-|
|---|-A-|---|---| -4th string
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5th fret
A
= 1, C
= 3, E = 5
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So to convert and A major to an A diminished I'm going to lower the
C (3)
on the 3rd and 1st strings down a half step to C( 3).
I am also going to lower the E(5) on the 3rd string down to
E ( 5).
|
Ao
|---|---|-C-|---|---| -1st string
|---|---|---|---|-A-|
|-C-|---|---|-E |---|
|---|---|-A-|---|---| -4th string
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5th fret
A
= 1, C = 3,
E
= 5
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Sure, this does not give you a nice neat comfortable fingering, but keep this in mind. In a real life playing situation you are not necessarily going to be playing all 4 strings of an arpeggio. The notes on the 3rd and 4th strings are a very common shape that is used to create bass lines over an A diminished chord.
If you were to convert the basic A minor arpeggio form below to an A diminished, that would give you a little more comfortable fingering.
|
Am
|---|-C-|---|---|---| -1st string
|---|---|---|-A-|---|
|---|---|---|-E-|---|
|---|-A-|---|---|-C-| -4th string
|
5th fret
A = 1, C = 3, E = 5
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Lower the E(5) on the 3rd string to E ( 5).
|
Ao
|---|-C-|---|---|---| -1st string
|---|---|---|-A-|---|
|---|---|-E |---|---|
|---|-A-|---|---|-C-| -4th string
|
5th fret
A = 1, C = 3, E = 5
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Here is another common major arpeggio shape converted to an A diminished.
|
A
|-A-|---|---|---| -1st string
|-E-|---|---|---|
|---|---|-C |---|
|---|---|---|-A-| -4th string
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5th fret
A = 1, C = 3, E = 5
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Lower the C (3) on the 3rd string down a half step to C( 3), and lower the E(5) on the 2nd string down to E ( 5).
|
Ao
|---|-A-|---|---|---| -1st string
|-E |---|---|---|---|
|---|---|-C-|---|---|
|---|---|---|---|-A-| -4th string
|
5th fret
A = 1, C = 3, E = 5
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This is not necessarily a comfortable position, but it will be useful to know where these notes are located.
Page 3, Converting A to A+
Page
5, Converting A to Asus2 
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