Courtesy Boing Boing, Lady Gaga refused to let Weird Al make a parody of her song with proceeds to charity, so he claimed fair use and released it anyway.
Maybe Weird Al can get hired at YouTube's Copyright School to put the First Amendment into the curriculum?
More on parody here. Boing boing's analysis here.
Purchase Copyright Litigation Handbook 2010 by Raymond J. Dowd from West here