He explains that in the blog post.
Right. The title of this article should be changed, then, as it really has nothing to do with Fair Use at all.
I assume most people here have various internet 'water-coolers' that they hang out on. I'm slightly bemused as to why this is apparently HN discussion fodder.
In my case (and I suspect most others) it is because the Copyright Cartel seems intent on pushing private privileges that were given during a time in which it made sense and they continue to pursue such privileges to the detriment of the rights of the people and the progress. Anything with Fair Use in the title is going to draw interest from some of us.
Though considering he already posted the song online, presumably against Lady GaGa's wishes, I don't really get why he doesn't just go ahead and put it on the album as well. Perhaps not having artist permission makes the label's lawyers nervous.