Brass Knuckles is the fifth studio album by American rapper Nelly, released on September 16, 2008. The album features guest appearances from Rick Ross, LL Cool J, T.I., Nate Dogg, Snoop Dogg, St. Lunatics and many other guest stars. Brass Knuckles is a pop-rap crossover album similar to the Country Grammar album but still shows Nelly’s hip-hop roots on songs like “Chill” which shows the St. Lunatics with their formerly imprisoned member City Spud. This song is the first song to feature all members since 2001’s “Groovin Tonight”.