he 's whistling as we approach and tho i ca n't see him yet and he ca n't see me , he changes the tune as he senses me coming to a song i reckernize , early one mo-o-rning , just as the sun was ri-i-sing , which he says was a favourite of my ma 's but which i think is really just a favourite of his since he 's whistled and sang it for me since i can remember .