Outside of Outkast, since everyone loves them, but...

Outkast "Gangsta Sht"
Three Six Mafia "Sippin On Sizzurp" both the OG Southern ones and the one with Dip Set
TI "Bezzle" - Bun and MJG have 2 of my favorite verses ever
Project Pat "Break Da Law 2001"
Youngbloodz "Damn" Remix
Bun "Get Throwed"
Rich Boy "Throw Some Ds" Remix
Lil Wayne "Cannon"


Some newer ones I enjoy
Black Hippy/TDE "Black Lip Bastard" Remix and "UOENO" Remix
Odd Future "Oldie"
Fabolous "This Is Family"