My wife and I celebrated our birthdays this year by going to see the Doobie Brothers in Las Vegas. (Friday night the 20th)
The show was great, packed house (Zappos Theater, Planet Hollywood)

I was amazed at how good Tom Johnston & Patrick Simmons voices still were, Michael McDonalds voice isn't what it was, but still decent.
Overall we thoroughly enjoyed it, I know they can't play everything, but there's a few old ones I would have liked to hear.

If you're a Doobies fan (Doobie Brothers that is  :wink:) and opportunity presents itself, go and see them.