Nothing quite like good ol' fashion bar sharing between two MCs. I have written before about the roots of this type of exchange and how good it can sound when done well.
There are a few artists that still get down like that here and there, although they don't do the harmonize rhyming old schoolers did.
Bad Meets Evil by Royce the 5'9" and Eminem has a few examples of this type of back and forth. One of my favorite tracks is A Kiss.
If you can get past the gratuitous misogyny and violence you'll see the that these two displayed real chemistry with their flow. They also managed to slip in lots of over-the-top humor on this solid beat.
"Or leaning out a window with a cocked shotgun Driving up the block in the car that they shot Pac in Lookin for Big's killers, dressin' ridi-culous Blue and red like I don't see what the big deal is Double barrel twelve gauge bigger than Chris Wallace Pissed off, cause Biggie and Pac just missed all this Watchin' all these cheap imitations get rich off em And get dollars that should've been theirs like they switched wallets And amidst all this Cris poppin and wrist watches I just sit back and just watch and just get nauseous And walk around with a empty bottle of Remi Martin Starting shit like some 26 year old skinny Cartman
All I see is sissies in magazines smiling
(He-he!)
Whatever happened to wildin out and being violent
Whatever happened to catchin a good old-fashioned passionate ass whoopin' and getting your shoes, coat, and your hat tooken
Marshal Mathers on a variety of topics, including, but not limited to: he anger regrading the unresolved deaths of two hip hop legends, rappers who capitalized on the death of those legends by stepping into their light and adapting their styles, and the dearth of good hardcore, unvarnished hip-hop music.