How else can you explain how groovy they are?  It turns out that before they were giving us all Saturday Night Fever, the Gibb brothers were a heavy metal band called the British Ghouls.  They put out an album called Satanic Royalty in 1964, covering topics such as satanism, Nazis, and zombies.

I’ll never be able to listen to “Staying Alive” the same again.

For more information, see this page:

http://www.bnrmetal.com/v2/bandpage.php?ID=BG

(and FYI – check out the date the above page was created. I just found it now and had to post it because I thought it was hilarious).