minstrel: Pastime with Good Company

[warden]

I stumbled upon a problem that might be of interest to this group:

King Henry VIII wrote a song called Pastime With Good Company" that is 
often sung as SCA and other medieval events.  It's a very catchy tune 
and there are many references to it on the Internet such as the following:

http://www.goldgryph.com/songbook/partsongs/past_1.gif

However, I recently found a print of the original music, which is 
slightly different.

http://tudorhistory.org/topics/music/picts/pastime.jpg

Note the 17th note.  Why is the sharp there?  Am I missing something?

Thank you!
-Robert Warden
Boulder, CO