When the album was leaked on February 22, the release date was moved up seven days to combat piracy. In January 2002, the two announced Best of Both Worlds in a New York City news conference. Kelly confirmed the album's existence and name in an interview with MTV at that year's Billboard Music Awards.

The positive reception to both songs opened dialog between the two for a possible joint album. Kelly's popular single ' Fiesta Remix' that shot up to fifth on the Billboard Top 100. Kelly appeared on Jay-Z's ' Guilty Until Proven Innocent'. It debuted at number one on the US Billboard 200 chart, selling 215,000 copies in its first week, and later was certified platinum by the Recording Industry Association of America (RIAA) in December 2004. Like its predecessor, the album was criticized for repetitive lyrics but was a commercial success. They were both sent to radio stations, but only the former saw a physical release. Unfinished Business was supported by two singles: ' Big Chips' and ' Don't Let Me Die'. Kelly responded by suing his co-act and touring company for $75 million for breach of contract, among other things, on November 2. Kelly from the tour claiming 'lack of professionalism'. Jay-Z and the tour promoter then banned R. Kelly was accused of erratic behavior and was pepper sprayed by a Jay-Z associate. The 'Best of Both Worlds' tour filled with tension and accusations that boiled over at an October 31 show where R.

Kelly and Jay-Z performing songs from both their solo and joint albums. The album was promoted by the 'Best of Both Worlds' concert tour with R. The album was composed of unreleased tracks from the recording sessions of 2002's The Best of Both Worlds, although slight additions were made. It was distributed in the United States and Canada by Jive Records and Island Def Jam Music Group, by the Bertelsmann Music Group (BMG) and its subsidiary Jive Records, except in Canada and the United States of America where Island Def Jam Music Group and its labels Def Jam Recordings and Roc-A-Fella Records replaced BMG. The album was released worldwide on October 26, 2004. Unfinished Business is the second and final collaboration album between American rapper Jay-Z and American singer R.

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