Re: "Generative music" and "Algorithmic composition"

[Philip Rhoades]

David,


On 2014-01-16 18:08, David Kastrup wrote:
> Philip Rhoades <address@hidden> writes:
>
> > > > \version "2.18.0"
> > > > \score {
> > > >   {
> > > >     $(let ((random-state (seed->random-state (current-time))))
> > > >        (make-sequential-music
> > > >         (map (lambda (x)
> > > >                (let ((idx (random 12 random-state)))
> > >
> > > >                  (make-event-chord
> > > >                   (list
> > >
> > > You can forego the above two lines (of course removing the respective
> > > closing parens later on) nowadays.
> > >
> > > >                    (make-music 'NoteEvent
> > > >                      'duration (ly:make-duration 2 0 1/1)
> > > >                      'pitch (ly:make-pitch
> > > >                              (quotient idx 7)
> > > >                              (remainder idx 7)
> > > >                              0))))))
> > > >           (make-list 24))))
> > >
> > > Ok, make-list is a tad-bit more basic and efficient than the iota I
> > > employed.
> >
> >
> > I get a GUILE error on line 5
> >
> >   $(let
>
> I don't.  Copy and paste error?
>
> >   $@(let
> >
> > but that didn't work either (obviously I don't know what I'm doing . 
> > .)
>
> Obviously.  $ splices a single expression (which is what
> make-sequential-music produces) into LilyPond, $@ splices a list of
> expressions.


I recopied and pasted the whole snippet - which gives the same result as 
right-click and save.

The original has:

  #(let . .

  http://lsr.dsi.unimi.it/LSR/Item?id=274

but I get a GUILE error on that too . .

Thanks,

Phil.
--
Philip Rhoades

GPO Box 3411
Sydney NSW      2001
Australia
E-mail:  address@hidden