Here‘s a simple playing by me of a chord-sequence that it produced. Here‘s a midi example that it produced by itself when I had it more developed.

There’s still a reasonable amount of work to be done on it, but it’s at a stage where it’s presentable.

Anyway, the current version of the haskell source code is here. Hopefully I’ll have more developed versions up in the future.

Basically, say we had a scale, and a gradus suavitatus on that, a measure of consonance, so that given any two intervals, you can say if one is more consonant than the other. Now given two scales, it might be a worthwhile thing to look for things that preserve relative consonance; that is to say, a function f from one scale to another will have to satisfy the rule a>b => f(a)>f(b).

So, I wrote a program to do it. No interface yet, it’s to be run from within ghci; specific details of how to use it are given (in a very rambling sort of way) at the top of the source code. It seemed like it might be most useful in looking for interesting transformations of melodic motives that have a small number of notes. However, I can’t say I have been able to do anything useful with it, alas.

For an example of the program’s output, see this file:

Harmony-preserving maps example ( ps | pdf ).

For the code itself, here’s the source file:

Harmony Preserving Maps Generator V0.1 ( hs )

So yeah. Out.

Counterpoint Analysis Program Tutorial/Fugue in Eb ( PS | PDF )

It should make the program make rather a lot more sense. Oh, and for the record, I don’t dislike the piece as much now as I did when I was writing the tutorial.

and, secondly, a rather dull affair:

Waking ( PS | PDF )

Well, that’s it for now. Have another compositional tool I’ve just finished, but want to see if I can do anything with it before putting it up.

V0.1 as of June 01 2007

So, this is a program that, when you input various melodies, will attempt to find contrapuntal relationships between them. I use something like a slightly weakened version of the 1st species counterpoint rules of Fuchs for this. As you may guess from the version number, this program is chiefly for my own use. However, I think it’s usable enough that it’s conceivable that other people might also use it. Oh, disclaimer: it doesn’t always (or even mostly) give great counterpoint examples, but that wasn’t so much the motivation; I wrote it because I’m never sure when writing fugues that I’m not missing some particular combination of themes that sounds especially nice; with this, I get straight away a bunch of combinations to play about with; many which I wouldn’t have seen without it I think (of course, I won’t limit myself to what this program outputs, but it’s a very good starting point I think), this makes it useful as a compositional tool for me.

No, no no, don’t expect any pictures (yet); it’s a console program (so far), so! And please, if you’ve anything to say about it, don’t hesitate to say it, either here or via email – I’m unlikely to do any work on it otherwise (as it fulfils my personal needs rather well in its current form).

Download Zip – Contains windows binaries, basic documentation, and Haskell source (should you wish to recompile it on a different platform).

Worked Example