Algorithmic Music Toolbox

blues_solo.py

@@ -28,9 +28,51 @@ def add_note(out, instr, key_num, duration, bpm, volume):
 
 """ these are the piano key numbers for a 3 octave blues scale in A
 	See: http://en.wikipedia.org/wiki/Blues_scale """
+
+# defins the scale and time 
 blues_scale = [25, 28, 30, 31, 32, 35, 37, 40, 42, 43, 44, 47, 49, 52, 54, 55, 56, 59, 61]
 beats_per_minute = 45				# Let's make a slow blues solo
 
-add_note(solo, bass, blues_scale[0], 1.0, beats_per_minute, 1.0)
+curr_note = 0 # initializes current note
+add_note(solo, bass, blues_scale[curr_note], 1.0, beats_per_minute, 1.0)
+
+# blues 
+licks = [ [ [1,0.5], [1,0.5], [1, 0.5], [1, 0.5] ], 
+[ [-1, 0.5], [-1, 0.5], [-1, 0.5], [-1, 0.5] ] ]
+
+# swing
+swing_licks = [ [ [1, 0.5*1.1], [1, 0.5*0.9], [1, 0.5*1.1], [1, 0.5*0.9] ],
+[ [-1, 0.5*1.1], [-1, 0.5*0.9], [-1, 0.5*1.1], [-1, 0.5*0.9] ],
+[ [2, 0.5*2.1], [-1, 0.5*0.9], [2, 0.5*1.9], [1, 0.5*1.1] ] ]
+
+for i in range(4):
+    lick = choice(swing_licks)
+    for note in lick:
+        curr_note += note[0]
+
+        # checks current note and defines volume
+        if curr_note < 0:
+            curr_note = 1;
+            volume = 2
+        elif curr_note > len(blues_scale) - 1:
+            curr_note = 1
+            volume = 4
+        elif curr_note != len(blues_scale) - 3:
+            volume = 3
+        else:
+            volume = 2
+
+        # uses function to add the note
+        add_note(solo, bass, blues_scale[curr_note], note[1], beats_per_minute, volume)
+
+# adds background music
+backing_track = AudioStream(sampling_rate, 1)
+Wavefile.read('backing.wav', backing_track)
+m = Mixer()
+solo *= 0.4             # adjust relative volumes to taste
+backing_track *= 2.0
+m.add(2.25, 0, solo)    # delay the solo to match up with backing track    
+m.add(0, 0, backing_track)
+
 
-solo >> "blues_solo.wav"
+m.getStream(500.0) >> "slow_blues.wav"