And if your mind isn't reeling enough from reading about the Miracleman case, here's Mental Floss with an essay of Fair Use of Copyright in the era of YouTube. Unfortunately, vigorous protection of copyright is how you have to protect it. If you don't, it can be argued that you don't have much of a claim. It's the only part of law I know of where "but they let so-and-so do it" is an adequate defense. Pity the author could let his work finishing his father's music video be displayed. It might even stir some sales of the song, even. Some people may say "I haven't heard that song in years" and didn't buy it before since it was played more often, then as it works it's way into the brain, they decide to buy the mp3 or the CD that it's on. At least I don't see where it would hurt it.