Note: Ian released the first page of the original scores to a couple songs on the Tull website, Velvet Green among them. I don't know how much this will help you (it sure has a lot of modulations in it) but here they are: http://www.j-tull.com/fans/sheetmusic/index.cfm
Re: For Jethro lovers 23:09 on Tuesday, March 27, 2012
Egretboy, Ta for the lead. Unfortunately, only part of the first page of the score is posted (and I'm not certain I will be able to follow the notation).
I found another site that does not have Velvet Green but does include a goodly amount of Ian Anderson material: http://search.musicnotes.com/?q=Jethro%20Tull&hl=y&cmpid=AFF_linkshare&arp=2&affsid=LS-Affiliate. Do enjoy!