Re: a:4 chord

[Luc Saffre]

Oops, errata:

an added 4th must be coded "c:5.4", not "c:add4".

Luc

On 19.03.2009 9:49, Luc Saffre wrote:
> Thanks, Brett.
> 
> To summarize for myself, and maybe some documentation maintainer wants
> to integrate that somewhere:
> 
> If I'm encoding chords from a previously published score, and there is a
> "C4", then (1) I try to find out what they really meant, and (2)
> depending on that:
> 
> If they meant...        Then I code...
> ----------------------  --------------
> c-e-f-g (added 4th)     c:add4
> c-f-g (suspended 4th)   c:sus4
> inverted power chord    (this was too confusing for me, so I can't
>                         summarize, but anyway I won't have that case.
> 
> And if I want one of those renderd as the short "C4" form, then I use an
> exception. For example if I want c:add4 to be rendered as c^4, then I do
> something like:
> 
>   chExceptionMusic = {
>     <c e f g>4-\markup { \super "4" }
>   }
>   % Convert music to list and prepend to existing exceptions.
>   chExceptions = #( append
>     ( sequential-music-to-chord-exceptions chExceptionMusic #t)
>     ignatzekExceptions)
> 
> And coding the short form "c:4" into the LP source is actually a bad
> idea because that yields c-e-f, which doesn't actually fit any of the
> above interpretations of "C4".
> 
> Luc
> 
> 
> On 19.03.2009 9:26, Brett Duncan wrote:
>> Luc Saffre wrote:
>>> Can somebody explain what's the difference between printing "A^sus4" and
>>> "A^4"? I had only basic music education but am helping with publishing a
>>> songbook using Lilypond, and I thought that the difference is not
>>> important. But now I'm afraid I'm wrong and that I'll have to check some
>>> songs again. Is that right?
>> The short answer is, it depends on who you are talking to!
>>
>> If you look at the Dolmetsch Online for example
>> (http://www.dolmetsch.com/musictheory17.htm), you'll find there that C4
>> means a C major triad with an added 4th (C-E-F-G). I know several jazz
>> musos who interpret it exactly this way.
>>
>> OTOH, others interpret C4 as a suspended 4th (C-F-G).
>>
>> Just to add to the confusion, some rock guitarists use this notation to
>> indicate an inversion of the classic "power" chord, which is really just
>>  an interval of a 5th (e.g. the C5 power chord is just C-G). A C4 in
>> this case is just an inversion of an F5 power chord, with just C-F.
>>
>> Personally, I prefer to avoid the potential confusion by not using the
>> notation C4 at all, and use Csus4 or Cadd4 to clear what I mean. (I
>> don't have to myself  the power chords, since they don't get used that
>> often in jazz ;-).
>>
>> One other thing to be aware of - if you put C:4 into LP, the chord you
>> get is C-E-F, which doesn't actually fit any of the above
>> interpretations of "C4". So if you want the power chord, for example,
>> you need to enter c:4^3 to remove the 3rd.
>>
>> HTH,
>> Brett
>>
> 
> 
>