I propose to compare the chords example given by Luis Pablo
Gasparotto with a software which has a chord dictionnary (power
tab editor)
>I'm convinced that a good point to start a CHORD STANDARIZATION
>is to
>see what are the concepts which everybody agree. I think this
>concepts are:
(I totally agree with you !)
C = C,E,G
CMaj7 = C,E,G,B
CMaj9 = C,E,G,B,d
CMaj11 = C,E,G,B,d,f
CMaj13 = C,E,G,B,d,f,a > the prog gives C,E,G,B,d,f,b
C7 = C,E,G,_B
C9 = C,E,G,_B,d
C11 = C,E,G,_B,d,f
C13 = C,E,G,_B,d,f,a > the prog gives C,E,G,_B,d,f,b
Cm = C,_E,G
Cm7 = C,_E,G,_B
CmMaj7 = C,_E,G,B > written Cm/maj7
Cm9 = C,_E,G,_B,d
Cm11 = C,_E,G,_B,d > the prog gives C,_E,G,_B,d,f (where is the
11th in your notes ?)
Cm13 = C,_E,G,_B,d,f > the prog gives C,_E,G,_B,d,f,b (non
altered b)
C6 = C,E,G,A
Cm6 = C,_E,G,A
Cdim = C,_E,_G > noted C� (but I think it's more common to write
Cdim)
Cdim7 = C,_E,_G,A
there are *only* few differences.
augmented is +
a chord diminish is �
C13(#11) is noted C13+11, Cm7(b5) is simply noted Cm7b5 (so the
pb with the convention on alternatives chords disappears)
something like C7 with 9th diminish and 5th augmented is noted
C7b9+5
someone raised the pb once : "- - what does Cb9 mean? (Cb)9, or
C(b9)?" I'm not a master in musical theory, but I don't think it's
possible to have only a C with a 9th which is diminished : you
have to note C7b9 or nothing, since the b9 is related to the 7th
: so Cb9 means Cb (_C in abc :) ) with a "natural/normal" 9th
which is an extension of the 7th. (oups, I've just seen Atte Andre
Jensen has allready answer on that)
I have some books on musical theory and they seems to agree on
that at least.
About the
> And I have heard the term "fifth chord" used to
>describe chords without a third, so this isn't all that
nonsensical
>an interpretation.
Yes, in some thrash metal guitar tab books I've this because
thirds sounds bad on a guitar with overdrive or distortion. So C5
is C and Cb5 is... ark "natural C with a b5" so C,E,_G
It can be in contradiction with what was said before (Cb9 ==
_C,_E,_G,__B,_d , equivalent to B9) but not if we bear in mind
that 9th, 11th and 13th are extensions of the 7th (unlike the
5th). So a Cb (_C) with a b5 (_5) would be : Cbb5 (and a Cbm with
a b5 would be Cbmb5)
Abc standard should use the convention given by Luis Pablo
Gasparotto (and eventually correct the C13 pb), but the problem
with abc is that "b" is a note, so the "b" for flat could be
remplaced by _ so Cbmb5 would be "_Cm_5" (or "C_m_5" ?), Cm7b5 ->
"Cm7_5" etc., but I think abc parsers could interpret Cm7b5 as
well : only the first term is the note, the other are extentions.
I would be
even clearer than using the flat and sharp convention used in
abc...
>But %%MIDI is not standard ABC.
>This is surely an issue for the interpretation of the ABC/MIDI
player, not
>for the standard (*laugh*) to define.
why not making %%midi a standard in abc ?
I really don't see what is the point of discussing chords
interpretation in abc programs if you don't need *hearing* them.
Put you chords into "" and whatever display program will display
it like it is written between the "" : "A5add8" "Ebsus58"
"D4addfelixthecatmiauling" etc.
Other (hearing) programs would need midi support, wouldn't they ?
Greetings
Eric.
ps :
The help file of Power tab editor explain how the chord
dictionnary was constructed :
"Key Identifies the key of the chord. This is a letter from A to
G, including any accidentals. The accidental type can be toggled
by using the Sharp and Flat buttons, located to the right of the
Key Selector.
Base Formula Identifies the "subfamily" of the chord. There are
only 14 possible formulas the chord can belong to: major, minor,
augmented, diminished, 5th (power chord), 6th, minor 6th, dominant
7th, major 7th, minor 7th, augmented 7th, diminished 7th,
minor/major 7th and minor 7th augmented 5th.
Extensions/Additions/ Alterations In order to create 9th, 11th and
13th chords, you must check the appropriate extension. EXTENSIONS
CHECK BOXES ARE ONLY ENABLED WHEN A 7TH CHORD FORMULA IS SELECTED.
This is simply due to the fact that extension chords must contain
a 7th (they are extensions of 7th chords). As an example, let's go
through the steps to construct an Emaj11 chord. First click the E
key from the key selector. Since the 11 is a major 11th, and you
know that 11ths are extensions of a 7th chord, select the maj7
formula from the formula list (if it were Em11, you'd select m7).
At this time, the extension check boxes will become enabled. Now
check the 11th extension. You should see Emaj11 in the preview
window. Additions and alterations are essentially toggles.
Bass Note This is the note that is the lowest note played in the
chord. When the bass note is the same as the key, it will not be
displayed. Otherwise the Bass Note will be tagged onto the end of
the chord name.
ps 2 :
>> | to a note? I'm using Jim Vint's program.
>
> Dunno about that program,
Jim Vint is the creator of abc2win http://abc2win.com/
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