title: Discord.py - VoiceClient. How can I call next audio file? play(source, *, after=None)
body: <p>I'm trying to do music discord bot using Discord.py 1.3.2.</p>
  
  <p>As my queue I'm just using normal list. List keeps paths to .mp3 files. Self.vc is voice client. Everything works fine, until songs end. I was trying to figure it out myself, but I can't find the answer. How to call next "song"? </p>
  
  <pre><code>self.source = FFmpegPCMAudio(self.queue[0])
  self.vc.play(self.source, after= what should be here?)
  </code></pre>
  
  <p>I was reading references and I don't understand what "(Callable[[Exception], Any])" means.</p>
  
  <p>Thanks for help!</p>