@@ -3,24 +3,30 @@ import os import random import sys import time random.seed(time.time()) - -grammars = { - "u": ["I V I IV u", "I IV", "I VII IV" , "e"], - "e": [""], -} - def main(): - key = "G#" + key = "C" + note_grammars = { + "u": ["I V I IV u", "I IV", "I VII IV" , "e"], + "e": [""], + } + chord_grammars = { + "u": ["I IV V IV I", "e"], + "e": [""] + } + compose_piece(key, note_grammars) + compose_piece(key, chord_grammars, chords=True) + +def compose_piece(key, grammars, chords=False): score = "" - while len(score.split()) < 50: + while len(score.split()) < 15: score = "u u u" - score = generate_score(score) - score = keyify_score(score, key) + score = generate_score(score, grammars) + score = transliterate_score(score, key, chords) score = generate_csound_score(score) print "f1 0 256 10 1 0 3 ; sine wave function table" for line in score: print line @@ -34,11 +40,11 @@ pos = (pos + p) % 12 scale.append(notes[pos]) return scale -def generate_score(score): +def generate_score(score, grammars): while 1: found_substitution = False for key,value in grammars.iteritems(): if score.find(key) != -1: found_substitution = True @@ -46,11 +52,11 @@ score = score.replace(key, random.choice(grammars[key]), 1) if found_substitution is False: break return score -def keyify_score(score, key): +def transliterate_score(score, key, chords=False): scale = make_scale(key) scale_conversion = { "I": 1, "II": 2, "III": 3, @@ -59,12 +65,21 @@ "VI": 6, "VII": 7, "VIII": 8, } keyed_score = [] - for token in score.split(): - keyed_score.append(scale[scale_conversion[token]-1]) + if chords is False: + for token in score.split(): + keyed_score.append(scale[scale_conversion[token]-1]) + else: + for token in score.split(): + chord = [] + root_note_index = scale.index(key) + scale_conversion[token] + chord.append(scale[root_note_index]) + chord.append(scale[(root_note_index+3) % 8]) + chord.append(scale[(root_note_index+5) % 8]) + keyed_score.append(chord) return keyed_score def generate_csound_score(score): csound_note_values = { @@ -82,12 +97,18 @@ "B": "11", } t = 0 csound_score = [] for token in score: - note = csound_note_values[token] - csound_score.append("i2 %f 2 7000 %d.%s %d.%s 0 6" % (t, random.choice([8,9]), note, random.choice([8,9]), note)) - t += .25 + if isinstance(token, list): # Chords + for note in token: + note = csound_note_values[note] + csound_score.append("i2 %(time)f 1 7000 %(octave)d.%(note)s %(octave)d.%(note)s 0 6" % {"time": t, "octave": random.choice([7,8]), "note": note}) + t += 1 + else: # Individual notes + note = csound_note_values[token] + csound_score.append("i2 %(time)f 1 7000 %(octave)d.%(note)s %(octave)d.%(note)s 0 6" % {"time": t, "octave": random.choice([8,9]), "note": note}) + t += .25 return csound_score if __name__ == "__main__": main()