What's Your Fantasy Supergroup?


Throughout the history of rock various established artist have joined together to form supergroups.  Groups along the lines of Crosby, Stills, Nash & Young, Asia, Blindfaith, Traveling Wilburrys, etc.  So my challenge is for you to put together what you think would be a great band consisting of well known artists.  The only guidelines I would offer is that the proposed band would have a primary vocalist and at least one songwriter.
Here's my fantasy band (a soul/gospel/funk outfit with a taste of New Orleans):
Mtume - percussionZiggy Modeliste - drumsJames Jamerson - bass guitarDavid Williams - rhythm guitarMac Rebennack - keyboardsPrince Rogers Nelson - lead guitar, vocalsAretha Franklin - piano, vocals
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Tchaikovsky, Robert Johnson, Chuck Berry, Duke Ellington, Buddy Holly, Chet Atkins, Mark Knopfler, Steve Howe, Chris Squire, Charlie Haden, Johnny Cash, Paul McCartney, John Lennon, George Harrison, Ringo, Phil Collins, Linda Ronstadt, Rosanne Cash.

I love Boxcar, Yoko and Diana, so that sounds great to me!  Have seen each live.  
Having heard Yoko Ono cover Adele, I think Adele should be added to the supergroup so that they can sing duets while looking lovingly into each other's eyes:

https://www.youtube.com/watch?v=ZsgMbxyDmCY
The concept of the Supergroup always seemed to be flawed in that it's so hard to size up or predict chemistry between the musicians.  They always seem to disappoint I think because they take a professional approach to producing their music under this platform instead of being really emotionally derived.  I know I'm generalizing but chemistry is so important...it is art after all.
Of course easy to answer:  john paul george and ringo, but not a fantasy at all, is it/was it?