You may or may not be aware that today is also Hermione Granger's birthday.
(Since i'm not sure if it's mentioned in the video comments, the artist is Tom Smith, who is also the creator of the official Talk Like a Pirate Day theme song. His web page is here: http://www.tomsmithonline.com/index.html)
Also, confirmation bias suggests that WinAmp knows what day today is, since it's randomly played Paul and Storm's Captain's Wife's Lament twice this morning.
It should be noted that of the 3424 songs in my current playlist i have two copies of Captain's Wife's Lament. One is 3 minutes long. The other is 10 minutes long. The above video is almost 40 minutes long. They actually start the song somewhere around 16-18 minutes in.