diff --git a/render.py b/render.py
index 7f49ec1..643af97 100755
--- a/render.py
+++ b/render.py
@@ -70,6 +70,20 @@ if not os.path.exists('VOCALS.json'):
 else:
     VOCALS = json.load(open('VOCALS.json'))
 
+if not os.path.exists('DRONES.json'):
+    DRONES = defaultdict(list)
+    for letter in os.listdir('drones'):
+        for fn in sorted(os.listdir(os.path.join('drones', letter))):
+            path = os.path.join('drones', letter, fn)
+            DRONES[letter[0]].append({
+                'path': path,
+                'duration': ox.avinfo(path)['duration']
+            })
+    with open('DRONES.json', 'w') as fd:
+        json.dump(DRONES, fd, indent=2, sort_keys=True)
+else:
+    DRONES = json.load(open('DRONES.json'))
+
 def get_path(id):
     global PATHS
     if id not in PATHS:
@@ -191,6 +205,8 @@ def sequence(seq, letter):
         'text': [],
         'vocals': [],
         'music': [],
+        'drones0': [],
+        'drones1': [],
     }
     duration = 0
     MAX_DURATION = 60 * 2 + 5
@@ -334,6 +350,29 @@ def sequence(seq, letter):
             blank = {'blank': True, 'duration': silence - silence_start}
             result['vocals'].append(blank)
     '''
+    # drones
+    if letter in DRONES:
+        for track in ('drones0', 'drones1'):
+            position = 0
+            while position < duration:
+                n = seq()
+                if n == 9:
+                    position += add_blank(result[track], min(3.141, duration - position))
+                else:
+                    clip = DRONES[letter][n]
+                    position += clip['duration']
+                    if result[track] and position > duration \
+                            and result[track][-1].get('blank') \
+                            and result[track][-1]['duration'] > clip['duration']:
+                        result[track][-1]['duration'] -= (position-duration)
+                        position = duration
+                if position <= duration:
+                    result[track].append(clip)
+                else:
+                    position -= clip['duration']
+                    break
+            if position < duration:
+                position += add_blank(result[track], duration - position)
 
     for track in result:
         if result[track]: