Some of my favorites.....
Rick Ross feat. Nas - Triple Beam Dreams (One of my favorite Nas verses EVER)
Scarface feat. Nas - In Between Us
Az feat. Nas - Mo Money, Mo Murder
Rick Ross feat. Nas - One of Us
DJ Khaled feat. Nas & Scarface - Hip Hop
youtube is blocked at my work so idk if it got posted yet but Ghetto Dreams is up there
the p**** or the mouth that is the question like shakespeare but my erection is the case here