[LAU] Chord finder

Lorenzo Sutton lorenzofsutton at gmail.com
Fri Jul 13 09:41:17 UTC 2012


On 13/07/12 11:28, Fons Adriaensen wrote:
> On Fri, Jul 13, 2012 at 11:05:02AM +0200, Funs Seelen wrote:
>> On Thu, Jul 12, 2012 at 7:21 PM, Rustom Mody <rustompmody at gmail.com> wrote:
>>
>>> The pythagorean comma is (by definition??) the gap between B# and C where
>>> by B#  means the 12th in a circle of perfect fifths starting at C.
>>>
>>>
>> I would say "a possible gap". It depends on the used temperament, in this
>> case Pythagorean (perfect fifth: 3/2). For example mean tone temperament
>> doesn't care that much about fifths and uses 5/4 for major thirds.
>> ...
> Writing B#, E#, Fb, Cb or using double accidentals is first of all
> a matter of consistent notation. A normal major or minor scale should
> have all of A..G (ignoring # and b) in it and not repeat one of them.
> That way the character (and the position of a note on a staff)
> corresponds one-to-one to the note's position in the scale.
>
> For example the last three notes of F# Maj. are written as
>    
>   D#  E#  F#
>
> and not
>
>   D#  F  F#
This can be helpful to visualise it:

http://en.wikipedia.org/wiki/Major_scale#The_circle_of_fifths

Lorenzo

>
>
> Now if the actual frequencies of E# and F need to be different
> depends on the temperament. If they need to, and the instrument
> doesn't have a separate key for E#, that just means you can't
> use the F# Maj. scale with the given temperament.
>
> Ciao,
>




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