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