For those of you interested in using J as an adjunct to lilypond or other such
program:
Making a few changes to the lilypond statements that get prepended and appended
to the notes generated (in my previous email on the subject). You can get
lilypond to generate a midi file of the score:
lilypondhdr =: ('\score{',LF);('\version "2.20.0"',LF);('\relative c''
{',LF);('\clef treble',LF);('\time 3/4',LF)
lilypondend =: (('\layout {}',LF);('\midi {}',LF)),<'}'
'lilymusic.ly' fwrites~ ; lilypondhdr,(LF,~ each lilypondnotes,<'}'),lilypondend
Basically adding the score tag and inserting '\layout {}’ and ‘\midi {}’ causes
lilypond to generate both a pdf of the score and a midi file that GargeBand or
other such program can play for you. When I generated MusicXML the musescore
program could play the tune right from the score.
Tom McGuire
> On Mar 29, 2020, at 2:39 PM, Thomas McGuire <tmcguir...@gmail.com> wrote:
>
> Using the wavefile.ijs that contains the VOSS routine for generating random
> note sequences:
>
> mynotes =: 30 voss 3
> mynotes
> 7 8 6 11 13 14 6 9 7 12 10 9 12 12 8 11 11 7 11 13 6 8 12 11 15 11 10 12 6 10
>
> NB. Then using the NumToName function in MusicalSyntax.ijs
> NB. I get a boxed list of note names with octaves (adding 60 makes them be
> around middle C):
>
> NumToName each ;/60+mynotes
> ┌──┬───┬───┬──┬───┬──┬───┬──┬──┬──┬───┬──┬──┬──┬───┬──┬──┬──┬──┬───┬───┬───┬──┬──┬───┬──┬───┬──┬───┬───┐
> │G4│G#4│F#4│B4│C#5│D5│F#4│A4│G4│C5│A#4│A4│C5│C5│G#4│B4│B4│G4│B4│C#5│F#4│G#4│C5│B4│D#5│B4│A#4│C5│F#4│A#4│
> └──┴───┴───┴──┴───┴──┴───┴──┴──┴──┴───┴──┴──┴──┴───┴──┴──┴──┴──┴───┴───┴───┴──┴──┴───┴──┴───┴──┴───┴───┘
>
> NB. Then massage that into something more lilypondish,
> NB. get rid of octave (you could convert the number into lilypond apostrophes
> to set the octave),
> NB. make letters all lowercase, change the sharp symbol to ‘es’.
> NB. Then put them into groups of 3’s for 3/4 time.
> NB. (Replace _3 ]\ with _4 ]\ to group for 4/4 qtr notes)
>
> ('%s %s %s'&sprintf) each <"1 ]_3 ]\ tolower each ('#';'es')&stringreplace
> each _1}. each NumToName each ;/60+mynotes
> ┌─────────┬───────┬───────┬───────┬───────┬─────┬─────────┬───────┬─────────┬─────────┐
> │g ges fes│b ces d│fes a g│c aes a│c c ges│b b g│b ces fes│ges c b│des b
> aes│c fes aes│
> └─────────┴───────┴───────┴───────┴───────┴─────┴─────────┴───────┴─────────┴─────────┘
>
> NB. So putting it all together you get the following
> lilypondnotes =: ('%s %s %s'&sprintf) each <"1 ]_3 ]\ tolower each
> ('#’;'is')&stringreplace each _1}. each NumToName each ;/60+mynotes
> ┌─────────┬───────┬───────┬───────┬───────┬─────┬─────────┬───────┬─────────┬─────────┐
> │g gis fis│b cis d│fis a g│c ais a│c c gis│b b g│b cis fis│gis c b│dis b
> ais│c fis ais│
> └─────────┴───────┴───────┴───────┴───────┴─────┴─────────┴───────┴─────────┴─────────┘
>
> NB. Now create a lilypondhdr:
>
> lilypondhdr =: ('{',LF);('\version "2.20.0"',LF);('\relative c''
> {',LF);('\clef treble',LF);('\time 3/4',LF)
>
> 'lilymusic.ly <http://lilymusic.ly/>' fwrites~ ; lilypondhdr,(LF,~ each
> lilypondnotes),(<‘}’,LF),(<‘}’)
>
> You end up with a file that looks like:
> {
> \version "2.20.0"
> \relative c' {
> \clef treble
> \time 3/4
> g gis fis
> b cis d
> fis a g
> c ais a
> c c gis
> b b g
> b cis fis
> gis c b
> dis b ais
> c fis ais
> }
> }
>
> Running it through lilypond gave me the following pdf
> <lilymusic.pdf>
>
>> On Mar 29, 2020, at 3:47 AM, Hauke Rehr <hauke.r...@uni-jena.de
>> <mailto:hauke.r...@uni-jena.de>> wrote:
>>
>> could one as easily have a lilypond file created instead?
>> since converting from MusicXML usually doesn’t work that well
>>
>> else I’d rather re-implement the music generation in scheme
>> (guile) in order to use it in lilypond directly
>>
>> Am 29.03.20 um 05:14 schrieb Thomas McGuire:
>>> I have a couple of files one is rough and hastily thrown together. But it
>>> pulls together a few ideas from various people and tries to implement a
>>> VOSS algorithm to randomly generate music in a fractal pattern. It will
>>> also generate MusicXML so you can load it it into a musical score
>>> application.
>>> Tom McGuire
>>>> On Mar 28, 2020, at 5:27 PM, Devon McCormick <devon...@gmail.com
>>>> <mailto:devon...@gmail.com>> wrote:
>>>>
>>>> Hi -
>>>> has anyone done work with generating music or musical phrases in J? I'm
>>>> helping someone develop a music training game that starts by generating
>>>> sounds with a particular key, tempo, and phrase length. The idea is to
>>>> help students to train their ears by testing them on their ability to play
>>>> back a randomly-generated musical phrase.
>>>>
>>>> I've told my collaborator that I think the generation part should be
>>>> relatively straightforward but I am not schooled in music, so I'm not sure
>>>> how to start.
>>>> I'm guessing that the second part of comparing the user's response to the
>>>> generated phrase will be more difficult but I'd like to get any kind of
>>>> start I can.
>>>>
>>>> Does anyone have any ideas about this?
>>>>
>>>> Thanks,
>>>>
>>>> Devon
>>>>
>>>> --
>>>>
>>>> Devon McCormick, CFA
>>>>
>>>> Quantitative Consultant
>>>> ----------------------------------------------------------------------
>>>> For information about J forums see http://www.jsoftware.com/forums.htm
>>>> <http://www.jsoftware.com/forums.htm>
>>> ----------------------------------------------------------------------
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>>> <http://www.jsoftware.com/forums.htm>
>>
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