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# This snippet is taken from:
# "The Polite Programmer's Guide to Ruby Etiquette" 
# http://bit.ly/hrwdPY

class BlackMagicStereo < Stereo
  def method_missing(name, *args)
    if sym.to_s =~ /^play_(\w+)$/
      system("open songs/#{$1}.m4a")
    else 
      # Here, very important! 
      # Don't forget to delegate up to previous implementation
      super 
    end
   end
end

def respond_to?(name)
  sym.to_s =~ /^play_/ || super 
end