"The Riverkeeper" is a song written and recorded by Seattle musician Patrick Daugherty, available for free download as an mp3 file. It's about the efforts of one man to restore a tributary of the much-polluted Duwamish River in Seattle. John Beal returned from Vietnam with severe health problems and was given only a few months to live. In despair he tried to do something to make the world a better place, starting with trashed Hamm Creek. Eventually the creek got better and so did John.