I can not play mp3 in pygame

[metulburr]

you need a main game loop to keep the script from reaching the end of the program.

add all this after your code in the first post

done = False
song_ended = pygame.USEREVENT + 1
while not done:
    for event in pygame.event.get():
        if event.type == song_ended:
            print('The song ended')