Pygame doesn't see the mp3 music file. What to do?

Question

pygame

What to do if the music file is not seen by pygame?

Is this possible in pygame?:

import pygame
pygame.init()
powerup = pygame.mixer.Sound('Jeremy Blake - Powerup!.mp3')
clock = pygame.time.Clock()
def song(song):
pygame.mixer.music.stop()
song.play()
song(powerup)