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> Dominant/diminished Sevenths
maddielou_
post Aug 12 2007, 01:36 PM
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Helloo.
Could anyone explain to me how dominant sevenths and diminished sevenths are formed?
I think I know, but i get confused.
Thanks!
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sbhoa
post Aug 12 2007, 01:41 PM
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Dominant seventh is built on the 5th degree of the scale (the dominant) and consists of the triad plus the 7th note from the root.
So in C the dominant seventh is G B D(the triad) plus F (7 notes up from G). It is F natural because it's the dominant of C and not of G.

Diminished sevenths are intervals of a minor third stacked up. There are 4 notes in the chord.
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maddielou_
post Aug 12 2007, 01:51 PM
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Thanks thats helped a bit
Still tad confused =p
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sbhoa
post Aug 12 2007, 01:58 PM
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QUOTE(maddielou_ @ Aug 12 2007, 02:51 PM) *

Thanks thats helped a bit
Still tad confused =p
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What don't you get still?
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clarinetgiggirl
post Aug 12 2007, 02:01 PM
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Diminished chords are really interesting! They are lots of minor 3rds on top of each other.

Eg. The minor third for D is F
then the minor 3rd for F is Ab,
the minor 3rd for Ab is Cb, which is the same note as B
the minor third for B is D

thus, D diminished is D, F, Ab, B, D.

Dominant 7ths - just take the 5th note of the scale and play that chord but with a flat 7th.

Hope that helps.
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Andy-piano-flute
post Aug 12 2007, 02:06 PM
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QUOTE(clarinetgiggirl @ Aug 12 2007, 03:01 PM) *

Diminished chords are really interesting! They are lots of minor 3rds on top of each other.

Eg. The minor third for D is F
then the minor 3rd for F is Ab,
the minor 3rd for Ab is Cb, which is the same note as B
the minor third for B is D

thus, D diminished is D, F, Ab, B, D.


and so eg diminished starting on F is the same 4 notes but starting on F i.e. F, Ab, B, D, F.

Actually you only have to remember diminished 7ths starting on C, C# and D to know them all
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sbhoa
post Aug 12 2007, 02:08 PM
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QUOTE(clarinetgiggirl @ Aug 12 2007, 03:01 PM) *

Dominant 7ths - just take the 5th note of the scale and play that chord but with a flat 7th.


If describing it as taking the 5th note of the scale I wouldn't refer to the flat 7th.
If you take the 5th note of C and play the dominant 7th you are still in the key of C and flattening the 7th would give you Fb not F natural.

If you describe the same dominant 7th chord as ON G rather than IN C then it would make more sense (to me anyway) to mention the flat 7th as you might assume that the key was G.

QUOTE
Actually you only have to remember diminished 7ths starting on C, C# and D to know them all

Or any 3 consecutive semitones...... (IMG:style_emoticons/default/wink.gif)
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maddielou_
post Aug 12 2007, 02:10 PM
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Ahhaaa
I am beginning to understand
I understand the dominat sevenths its the diminshed ones that confuse me

Sbhoa - i didn't understand about the diminshed sevenths.

Thanks everyone for your help!
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sbhoa
post Aug 12 2007, 02:13 PM
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Does Clarinetgiggirl's post help?

If not which part is the problem... is it the interval of a minor 3rd?
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maddielou_
post Aug 12 2007, 03:16 PM
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Yeah I understand now (IMG:style_emoticons/default/smile.gif)
Thank yoouuu!
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