Not that many but the ones they had were noticeable.

Streetlife is has been on every album except their first.

The W - Junior Reid, Redman, Snoop Dog, Nas, Busta Rhymes

Iron Flag - 12 O'Clock, Prodigal Sunn, Flavor Flav, Ron Isley

8 Diagrams - Erykah Badu, Gerald Alston, George Clinton

A Better Tomorrow - Nathaniel

And Tekitha honorable mention.

Its hard to beat that W featurings, impossible even.