Kate Davis made Southern Comfort, a wonderful Storyville film about Robert Eads, a transsexual suffering from ovarian cancer.

In The Fine of Whistling, Davis, with co-director David Heilbroner, tackles the question of why it is that people are inspired to make quite complex forms of music by whistling. What is the point of whistling? Why do we do it?

Wolf whistling is a very minor part of the overall picture. As the film demonstrates, whistling has a long history in the United States - it's synonymous with a sort of pleasure taken in working and is passed on to other people.

But the International Whistling Convention held in Louisburg, North Carolina supplies fresh insights into the nuttiness of humankind.