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16 March 2012
I'm pleased to announce the first release of the Csgrouper musical program.
*** What is it?
Csgrouper is a Perl program that generates Csound score.
*** What's the need?
Many powerful sound shaping and sequencing programs exist nowadays but the
western musical language in itself is almost completely worked up. The result is
a repetition of well-known musical patterns in popular harmonies and a privilege
for pure sound treatment in musical research.
Therefore there is an opportunity to investigate in musical language innovation
that Csgrouper wants to grasp.
*** What are the means?
There are two related paths followed by Csgrouper.
Polytonality (meant in a special way):
On one hand, Csgrouper allows to produce musical sequences with a different
number of intervals (from 2 to 24 against 12 in the traditionnal system). These
sequences are generated from permutationnal functions that work on pure
frequencies. The user must provide his or her code of compatible Csound
instruments that are then integrated into the part managed by Csgrouper (some
test instruments are provided in the package for a quick start).
Polymodality:
On the other hand Csgrouper can reduce the number of intervals in the selected
sequence tonality so as to produce a mode. Classic modes are available as well
as invented ones.
These basic tools together with a developable set of a dozen serial sequence
production functions permit the creation a list of sequence definitions, each of
them having its proper number of intervals and/or mode and its own instrument,
size, tempo, development rules etc...
In a later stage, sequences defined in this way can be grouped together into
sections showing various rythmic and harmonic properties according to choices
made by the user like grouping several sequences into a rythmic canon, or an
ensemble section that will proceed on selected sub-sequences determined by
inter-sequences note relations, or choosing a rythmic model (binary, ternary,
mixed) etc..
At last Csgrouper evaluates the proposed structure and prints its Csound unified
score part in case the evaluation succeeds. The resulting sound file can be
played directly from the GUI or recorded on disk. The Csgrouper and
Csound parts and instruments are all saved into a Csgrouper .xml config file.
But this output (hear the 7 voices/18 tones raw example from note 2) is not yet
music, it's just a computer aided inspiration that can serve to escape a
culturally restricting inspiration context, often already entirely explored.
The real music comes only as a creative act on Csgrouper output, like sculpture
on stone or wood. Personally I treat Csgrouper-Csound output in another
software, more convenient, like Blue.
*** What are the flaws?
Csgrouper could be improved in many ways. Csgrouper has bugs. For the time being
it's not pure spaghetti code, but you have to appreciate tagliatelle somehow.
Csgrouper is not easy to use. The serial functions (particularly "train"
functions) are difficult to understand and require prior analysis through
provided subroutines (from the "Series" tab).
Csgrouper Tk GUI is inadequate, and looks outdated. Besides, the program can't
be run properly without looking at some additionnal output from the terminal.
Csgrouper is processing slowly: count several dozens od seconds to load a short
piece of a few minutes and another similar time to evaluate it before it's
ready for audio output.
Csgrouper provides no test suite.
*** What is my proposal?
I offer this piece of code for sharing on Github, and I'd like programmers
interessed by this project to invest their time in improving it. I'll be happy
to see the project fork, become smarter, less redundant, have a new and better
GUI and reach quality standard to help musicians do music.
emilbarton@ymail.com
Notes:
1: Cf. ~/Csgrouper/run/sndout/xpace-flute_raw-csg.csd : This raw Csgrouper score
(and related audio output on the Csgrouper download page) is made on a 18 notes
scale which means thirds of tones. The serial material used was chosen for its
tonal properties which yield a harmonious aspect in spite of the lack of dominant
position in the 18 notes scale. Feel free to sculpt on it!
2: http://www.emilbarton.net76.net/data/ contains an "xpace-flute_raw-csg.mp3"
and a quickly transformed (sculpted) version of the same part named "ballad.mp3".
These sound files can also be heard from http://www.wix.com/emilbarton/data.
EOF
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