They Call Me Cpt. Obvious

If you hadn't already heard (or heard of) this tune, you need pry your ear pieces from between your rear end. It's a massive tune, and I'm guessing it's already the soundtrack to a lot of people's summers. Both artists are renowned in what they do, Nas all but creating Hip-Hop and Rap & Damian 'Jr. Gong' Marley perpetuating the reggae and ragga feel his Dad helped to expose.
If this tickles your fancy, check out the rest of the album, Distant Relatives.