# File lib/rubygame/music.rb, line 108
  def initialize( music=nil )
    if( music.instance_of? SDL::Mixer::Music )
      @struct  = music
      @volume  = 1
      @repeats = 0
    else
      raise( NotImplementedError, "Music.new is not implemented. "+
             "Use Music.load to load a music file." )
    end
  end