I have been listening to music for a very long time , I have always had visions of what 2 singers I would like to do a Duo
Mine is , Meatloaf and Tina Turner ,
Who would be yours

My dream has already been made. Skunk Anansie and Bjork. They're my two favourites, and they worked together on a version of Army of Me. It was amazing.

James Morrison and Pixie Lott
Though I'm excited for the Jason Derulo and Pixie duet

Britney and GaGa
Britney and Cheryl Cole
Britney and Glee Cast

Green Day / Aerosmith
Leona Lewis / Kelly Clarkson
Carrie Underwood / Shania Twain

are the ones that immediately jump to mind anyway...

Bruce Springsteen and Bob Dylan

Enya & Marilyn Manson

Gaga and Madonna
Gaga and Britney (but they'd never do it live, obviously)
Gaga and Michael Jackson
Gaga and Jay Z

Amy Winehouse and Cliff Richard

The ultimate ever would have been Madonna and MJ which sadly can obviously not happen now.

Others I'd love though:
Britney/Lady Gaga
Britney/Christina
Lady Gaga/Madonna
Kelly Clarkson/Carrie Underwood
Black Eyed Peas/Beyonce
Beyonce/Mariah
Mariah/Lady Gaga
Kelly Rowland/Jay Z

Richard Hawley and Thea Gilmore.