It seems funny that a company that calls itself “Larrikin Music” should be taking serious court action over riffs allegedly copied from a classic Australian song about a native bird famous for its warbly laugh - but that said, judgment is set down for delivery tomorrow in the court of Justice Jacobson, who must decide whether Australian band Men at Work reproduced a “substantial part” of that famous Australian children’s song, Kookaburra Sits In The Old Gum Tree for its 1981 pub-anthem Down Under.