Hangman

Recently I was looking around on YouTube and ran across a song from a show in 1975 called "Hangman". Has anyone heard of it? And if so does anyone know anything about it? http://www.youtube.com/watch?v=CdtbcRDISjM

Of course it is well known my friend.

The live is one of the famous bootlegs, and of course one of my favorites. Oh yeah, I like that Hangman so much.
Well, for your info. about this song...
http://www.pemcom.demon.co.uk/queen/covers/hangboot.html
http://www.pemcom.demon.co.uk/queen/covers/hangman.html