Numpy to song with octaves and random pixel choice

numpy_to_song_octaves_rand.py

song = np.array([]) 
octaves = np.array([1/2,1,2])
sr = 22050 # sample rate
T = 0.1    # 0.1 second duration
t = np.linspace(0, T, int(T*sr), endpoint=False) # time variable
#Make a song with numpy array :]
#nPixels = int(len(frequencies))#All pixels in image
nPixels = 60
for i in range(nPixels):
    octave = random.choice(octaves)
    val =  octave * random.choice(frequencies)
    note  = 0.5*np.sin(2*np.pi*val*t)
    song  = np.concatenate([song, note])
ipd.Audio(song, rate=sr) # load a NumPy array