Coehn - Synthesizer - Fixed

import play
import pygame
play.set_backdrop('light blue')

text1 = play.new_text("Minecraft piano for fun!", x = -200, y = 250)
text2 = play.new_text("Created in python!", x = -200, y = 200)
text3 = play.new_text("Create your melody by pressing the keys!", x = 0, y = 150)
piano = play.new_image("piano.png", x = 50, y = 225,size = 30)
key_clear_melody = play.new_box(color='blue',border_color = 'gold', x = -200, y = -200, width = 200, height = 100)
kcm = play.new_text(words='clear melody', x=-200, y=-200, font_size=45)
key_play_melody = play.new_box(color='red', border_color = 'gold', x = 200, y = -200, width = 200, height = 100)
kpm = play.new_text(words='play melody', x=200, y=-200, font_size=45)
sound = pygame.mixer.Sound("clear_melody.wav")
b_p = play.new_circle(x=-180, y=-125, radius=10)
txt_p = play.new_text(words='piano', x=-145, y=-125, font_size=20)

b_g = play.new_circle(color='blue', x=-80, y=-125, radius=10)
txt_g = play.new_text(words='guitar', x=-45, y=-125, font_size=20)

b_v = play.new_circle(color='blue', x=20, y=-125, radius=10)
txt_v = play.new_text(words='violin', x=55, y=-125, font_size=20)

b_f = play.new_circle(color='blue', x=120, y=-125, radius=10)
txt_f = play.new_text(words='flute', x=155, y=-125, font_size=20)

@play.repeat_forever
def switch ():
    for i in instrument_buttons:
        if i.is_clicked:
            global instrument
            instrument = instrument_buttons.index (i)
            for j in instrument_buttons:
                j.color = "blue"
            i.color = "black"


instrument = 0
instrument_buttons = [b_p, b_g, b_v, b_f]

keys = []
sounds = [[],[],[],[]]

for i in range(8):

    key_x = -350 + i * 100
    key = play.new_box(color='white', border_color = 'black', border_width=3, x =key_x, y = 0, width=80, height=200)
    keys.append(key)
    p_sound = pygame.mixer.Sound ("pia" + str(i+1) +'.ogg')
    g_sound = pygame.mixer.Sound ("git" + str(i+1) +'.ogg')
    v_sound = pygame.mixer. Sound ("vio" + str(i+1) +'.ogg')
    f_sound = pygame.mixer.Sound ("fl" + str(i+1) +'.ogg')
    sounds [0].append (p_sound)
    sounds [1].append (g_sound)
    sounds [2].append (v_sound)
    sounds [3].append (f_sound)

buttons = ["a", "s", "d", "f", "g", "h", "j", "k"]
image = []
melody = []

i1 = play.new_image("creeper.png", x = -350, y = 0,size = 20)
c = play.new_text("C", x = -350, y = -75)
image.append(i1)

i2= play.new_image("skeleton.png", x = -250, y = 0,size = 15)
image.append(i2)
d = play.new_text("D", x = -250, y = -75)

i3= play.new_image("enderman.png", x = -150, y = 0,size = 25)
image.append(i3)
E = play.new_text("E", x = -150, y = -75)

i4= play.new_image("steve1.png", x = -50, y = 0,size = 45)
image.append(i4)
F = play.new_text("F", x = -50, y = -75)

i5= play.new_image("chicken1.png", x = 50, y = 0,size = 20)
image.append(i5)
G = play.new_text("G", x = 50, y = -75)

i6= play.new_image("spider.png", x = 150, y = 0,size = 8)
image.append(i6)
A = play.new_text("A", x = 150, y = -75)

i7= play.new_image("wither.png", x = 250, y = 0,size = 33)
B = play.new_text("B", x = 250, y = -75)
image.append(i7)

i8= play.new_image("dragon.png", x = 350, y = 0,size = 13)
C = play.new_text("C", x = 350, y = -75)
image.append(i8)

# You had this twice, one without a 'clear' command
# This is why the recorded sound won't go away!
@key_clear_melody.when_clicked
def play_sound():
    melody.clear()
    sound.play()

@play.when_program_starts
def start():
    pygame.mixer_music.load("hello.mp3")
    pygame.mixer_music.play()

@key_play_melody.when_clicked
async def play_m():
    for i in range(len(melody)):
        await play.timer(seconds=0.5)
        sounds[instrument][melody[i]].play()

@play.repeat_forever
async def play_instrument():
    for i in range(len(keys)):
        if keys[i].is_clicked or play.key_is_pressed(buttons[i]):
            keys[i].color = 'light grey'
            sounds[instrument][i].play()
            await play.timer(seconds=0.3)
            keys[i].color = 'white' #alternately, "white"
            melody.append(i)

play.start_program()