[Haskell-cafe] Haskore Wiki

[Lemming]

Shae Matijs Erisson wrote:

> I've used Haskore before, but I wasn't able to figure out how to make infinte
> compositions. I'd like to try turning a lorenz fractal into music, could you
> point me to an example of such an infinite song?

Here is some non-periodic song based on a sequence of natural numbers:
   http://cvs.haskell.org/darcs/haskore/src/Example/Flip.hs

A Markov chain can also be used to produce infinite songs:
   http://cvs.haskell.org/darcs/haskore/src/Example/Kantate147.hs

 > Can you actually play such a thing from Haskore?

Yes, but with restrictions.

You can render the music into an audio stream which you pipe through 
some external player like Sox' 'play' command. I successfully did this:
   http://cvs.haskell.org/darcs/synthesizer
      (Presentation.playMusicSignal)
but the rendering of signals does not allow much polyphony or 
complicated sounds.

MIDI files unfortunately have a length specification in the header, thus 
they can't be infinite, unless there is a trick to define open-end 
tracks. Nevertheless, the MIDI functions can now handle infinite music 
properly. MidiFile is also based on relative times which is essential 
for long music.

Someone told me that CSound is also able to receive song information 
through a pipe, but I couldn't get this running so far. :-(