Jay-Z, Biggie - Brooklyns Finest
Pushing the boundary of a duet
I know this is an unorthodox example of a "duet" - and may not fit the exact goal of the bead - but I thought it would make an interesting add to the Bead.
In Jay-Z's debut album, Biggie Smalls makes an appearance - and a dope one at that! The two bounce off each other, doing a few bars each and even overlapping on some lines. This is an urban/modern duet if I've ever seen one.