Whistling

I cannot whistle. I enjoy the sound of whistling. I enjoy trying to figure out a tune I've heard before. There should be more whistling and humming in the world. Can one whistle or hum angrily? It is something adults can do instead of skipping. I've never seen a child skip angrily or an adult hum/ whistle when not happy. Whistling is like birdsong. Birdsong is something I cannot get enough of. If you want to make me happy whistle or sing like a bird.