sentences:  "County Grammar" has since been certified ten times platinum by the Recording Industry Association of America, and as of January 2011 had sold 8,489,000 copies in the United States, making it the fourth highest-selling hip hop album of all time.The following year, Nelly collaborated with the vocal group Jagged Edge on the single "Where the Party At" and appeared on a remix of "Girlfriend", a song by American boy band 'N Sync, in 2002; both songs reached the top five of the Hot 100.Nelly's second studio album, "Nellyville", was released in the same year.