There are two kinds of worries - those you can do something about and those you can't. Don't spend any time on the latter.
Duke EllingtonI began by tinkering around with some old tunes I knew. Then, just to try something different, I set to putting some music to the rhythm that I used in jerking ice-cream sodas at the Poodle Dog. I fooled around with the tune more and more until at last, lo and behold, I had completed my first piece of finished music.
Duke Ellington