Was listening to confessions and thought it was crazy Usher and Kanye only collaborated (as artists) once. Any other surprising examples?

PND and Big Sean is another one I thought of

Beyonce and J Cole is another surprising one

John Lennon & David Bowie - Fame

Drake and Kid Cudi

birdman and pusha t

Michael Jackson & Jay-Z - Girls Girls Girls remix

Bob Dylan & Kurtis Blow - Street Rock

Andre 3000 and Gwen Stefani