On 9/26/2017 10:59 PM, David Nalesnik wrote:
> Hi all,
>
> I wanted to share something which I think illustrates the power that
> Lily has over other popular notation software.
>
> I spend a lot of time teaching partwriting to undergraduate music
> majors, and recently, suddenly, it occurred to me that anything as
> rule-bound as correct partwriting (I stress "correct" as opposed to
> "artistic" or even "interesting") would naturally be the province of
> computers. A computer should be able to instantly provide all
> possible solutions to a problem with so many constraints.
>
> (1) a rather constrained range for the voice parts (a central octave
> for upper parts, slightly more for the bass--perhaps suitable to a
> beginning or an ending);
> (2) all parallel perfect intervals are disallowed;
> (3) consecutive fifths/octaves by contrary motion are disallowed;
> (3) approach to perfect fifths and octaves in outer voices by similar
> motion is disallowed unless the soprano moves by step ("direct fifths
> and octaves"); I'm aware that other practices may be more
> severe--easy to incorporate stricter requirements. (See how I deal
> with parallels.)
> (4) voice parts may not cross or overlap.
> (5) adjacent upper voices may never be more than an octave apart;
> (6) certain intervals are disallowed (I do allow the diminished 5th
> for the sake of the lovely fa-ti-do in the example progression);
> (7) the bass is prevented from leaping over an octave (never thought
> of this until I saw preliminary output);
> (8) all chords are complete;
> (9) the root is doubled.
> (10) the leading tone must resolve to tonic unless it is in an inner
> voice, when it may drop to the dominant pitch.
>
>
> Anyway, sorry to go on so long. FWIW...
>
> Comments welcome!
>
> Best,
>
> David
>
David,
This looks awesome...LilyPond is so powerful and capable for many
applications!
Thank you for sharing this with us!
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