If you are not convinced yet, here is a short list of reviews of the Songbook:
http://www.corfid.com/gl/press/press34.htm
by Scott D. McCormick
http://www.corfid.com/gl/press/press18.htm
from the National Post
http://www.corfid.com/gl/press/press21.htm
from mylaunch.com
http://www.corfid.com/gl/press/press06.htm
from Salon 1999
http://www.corfid.com/gl/press/press24.htm
from the Windsor Star
http://www.corfid.com/gl/press/press07.htm
from Variety.com
http://www.corfid.com/gl/press/press04.htm
From Globe and Mail
http://www.corfid.com/gl/press/press27.htm
from Jam!Showbiz
http://www.corfid.com/gl/press/press09.htm
from Livedaily.com
http://www.corfid.com/gl/press/press10.htm
another one from Jam!Showbiz
http://www.corfid.com/gl/press/press11.htm
from the Toledo Blade
http://www.corfid.com/gl/press/press41.htm
from
www.tccpalm.com
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An abundance of personal reviews (total of 36) can also be found at
http://www.amazon.com. Needless to say, all are very positive.
Lastly, you should also visit Valerie's website. She reviewed the songbook and you can listen to short clips of the rarities there:
http://24.228.1.81/vlmagee/Songbook.html
GO GET IT!