title: NoneType object has no attribute 'play'
body: <pre><code>import pygame as pg, sys
  from pygame.locals import *
  import os
  
  pg.mixer.pre_init(44100, 16, 2, 4096) 
  pg.init()
  
  a = pg.mixer.music.load("./Sounds/ChessDrop2.wav")
  a.play()
  </code></pre>
  
  <p>The code above is what I have written to test whether sound can be played through pygame. My 'ChessDrop2.wav' file is a 16 bit wav-PCM file because when the file was 32 bit PCM, pygame recognised it as an unknown format. Now that error is gone when I run the code but the error below pops up on my shell instead. I have assigned the sound file to the variable 'a' so shouldn't the sound play? My version of python is 3.6.1 and pygame is 1.9.3.</p>
  
  <pre><code>a.play()
  AttributeError: 'NoneType' object has no attribute 'play'
  </code></pre>