Hofstadter (he of Godel Escher Bach) naturally has a lovely essay on
Chopin reproduced in Metamagical Themas, which might be helpful as well.
Regards,
Sterl.
On Jun 5, 2008, at 2:46 PM, Kenn Knowles wrote:
David Cope's early research seems relevant. Some LISP code to train a
Markov chain on Bach is available from the web page for his current
class.
http://arts.ucsc.edu/faculty/cope/music206b.html
He eschews higher-order functions; using them, you should be able to
port it to very concise and readable Haskell. For the musical side of
things, the powerpoint presentations hint at additional data you can
put into your states and transitions to get better results for e.g.
cadences, characteristic embellishments, and melodic arcs.
Hope this is helpful,
- Kenn
On Thu, Jun 5, 2008 at 11:27 AM, Achim Schneider <[EMAIL PROTECTED]>
wrote:
The recent discussion about Markoff chains inspired me to try to
train one with all the Bach midi's I have on my disk, collecting
statistics on what intervals tend to get played simultaneously,
which follow others and in which way the pitch offsets from its mean,
so that melodies fall and raise "naturally".
The rationale is that if it's Bach, it's harmonious but not
respecting
any kind of usual chord progression.
So far, I got (a bit confused around the edges):
getMid mf = do
mid <- MidiLoad.fromFile mf
return $ MidiRead.retrieveTracks mid
toMelody :: MidiMusic.T -> StdMelody.T
toMelody = Music.mapNote f
where
f note =
let body = MidiMusic.body note
in Melody.Note StdMelody.na (MidiMusic.pitch body)
main = do
args <- Env.getArgs
let mf:[] = args
m <- getMid mf
putStr $ Format.prettyMelody $ Optimise.all
$ Music.chord $ map (\m -> Music.line $ map toMelody m) m
which results in
chord
[e 3 bn na,
chord
[b 2 wn na,
line
[hnr, d 3 wn na, hnr, cs 3 hn na, a 2 hn na,
chord [cs 3 hn na, line [b 2 hn na, c 3 hn na]]]]]
, for a set of random clicks in rosegarden's matrix editor.
Right now, I'm desperately searching for functions that can help me
analyse this beast, which afaict right now works best by having a
multitude of transformations (e.g. one big top-level chord with
maximum
polyphony and a hell a lot of rests) that provide easy access to
whatever information is needed.
Does anyone of you know about previous work in this area? I don't
want
to break cultural imperatives by not being as lazy as possible.
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