class Song
	def initialize(name,song,duration)
		@name = name
		@song = song
		@duration = duration
	end
	def to_s
		"song: #@name - #@song (#@duration)"
	end
end
class KaraokeSong < Song
	def initialise(name,song,duration,lyrics)
		super(name,song,duration)
		@lyrics = lyrics
	end
end

song = KaraokeSong.new("Bright Eyes", "Lua", 218, "If you walk away, i'll walk away")