app.py

from pyo import *

# Initialize the server
s = Server().boot()

# Define the pitch progression and create a MIDI pitch object
pitches = [0, 1, -2, 1]
midi_pitches = [midiTrans(p, "C4") for p in pitches]

# Create a sine wave oscillator and envelope
osc = SineLoop(freq=midi_pitches, feedback=0.08, mul=0.5)
env = Adsr(attack=0.01, decay=0.3, sustain=0.1, release=1.5, dur=2, mul=0.5)

# Play the pitch progression twice
osc.ctrl()
env.ctrl()
for i in range(2):
    for pitch in midi_pitches:
        env.play()
        osc.freq = pitch
        s.gui(locals())

# Gradually turn creepy
creepy_notes = [3, 6, 9, 10, 13, 16] # Random creepy MIDI notes
time = s.getStartTime() + 2 # Start at 2 seconds
index = 0

# Play creepy notes every 2 beats
def play_creepy_notes():
    global time, index
    pitch = creepy_notes[index % len(creepy_notes)]
    osc.freq = midiTrans(pitch, "C4")
    env.play()
    time += 0.5
    index += 1

pat = Pattern(play_creepy_notes, 0.5).play()

# Randomize pitch progression
def randomize_pitch():
    random.shuffle(midi_pitches)
    osc.freq = midi_pitches
    s.gui(locals())

pat = Pattern(randomize_pitch, 1).play()

# Stop the server after 20 seconds
s.stop(20)