4Salt-

Excellent catch - I brainfarted the two guitar heroes! I believe Steve Vai also played for Frank Zappa, another connection. Kip Winger played for Zappa as well, so the tree grows that direction.

Shania Twain Her later stuff sounds like Def Leppard lite thanks to Mutt!

As you mentioned Dio, he sang for Black Sabbath, another connection.

Sabbath = Ozzy, so follow the trail that way....

And of course you remember Coverdale/Page - now even Led Zeppelin is linked to Deep Purple. I guess that means that Allison Krauss has a pedigree as well!!!

Now, unless I can link 'Til Tuesday to Deep Purple, I can't get a connection of Rush for Brewer. I'm sure that would be sacreligious anyway

Keep them coming, the more obscure the better!