I’m going to cover my eyes and ignore that Slate just reposted their article about why s’mores are terrible – too far! Even for you, Slate! – and direct you to this one about the paper trail for the copyright for “Happy Birthday To You”.
Interesting tidbit: there might be enough evidence to invalidate the current copyright, but no one bothers because it’s cheaper to pay Time Warner than fight about it in court.
But what about the cost inflicted on society by every single chain restaurant that has to come up with their own terrible ‘happy birthday’ song? What about that?!
(Update 2018 September 28: I’m happy to update that as of 2016, “Happy Birthday” is in the public domain)