Clint,
Have you heard the XM Radio recording of this tune? Tull performed the entire Aqualung album live in the studio for an XM broadcast in 2004. Ian Anderson refers to it as "Hymn 43, with amendments." It opens with the song played as a jig. I like it better than the original arrangement.
It's here:
http://www.youtube.com/watch?v=pC0XzBHS09w