If it's just a couple of people sitting around chatting I'd probably put some downtempo dubstep on, or maybe a couple of Sandy Denny records. I doubt I'd bother making much of a playlist since it would just be there to sit in the background. But if it was anything approaching a party then I'd be playing things like E-40, Skepta, Dead Kennedys, Fig 4.0, Kid Dynamite, Red Forty, Gorilla Biscuits, Benga, DJ Scotch Egg, Public Enemy, Roll Deep, Wu-Tang Clan, Saves The Day, Beat Happening, All Girl Summer Fun Band, Cub... things you can dance to or engage in some silliness with.