I made a script that turns screen brightness up and down, synchronized to the music:
```python
import pyaudio
import numpy as np
import os
import time
def brightness(b):
os.popen("/usr/local/opt/brightness/bin/brightness %f" % b)
CHUNK = 2**12
RATE = 44100
p = pyaudio.PyAudio()
stream = p.open(format=pyaudio.paInt16, channels=1, rate=RATE, input=True,
frames_per_buffer=CHUNK)
while True:
data = np.fromstring(stream.read(CHUNK), dtype=np.int16)
peak = np.average(np.abs(data)) * 2
bars = "#" * int(1000 * peak / 2**16)
f = float(0.1 + peak * 10.0 / 2**16)
brightness(f)
print("%s %f" % (bars, f))
stream.stop_stream()
stream.close()
p.terminate()
```
