Two artists who labeled themselves 'The best of both worlds', Jay-Z - hip-hops biggest entrepreneur and R. Kelly - the man who brought r'n'b to the masses. However despite their obvious talents the music rarely reached the same level as their solo work. However this combo will always be remembered for their dramatic fall out during the Unfinished business tour where R Kelly stormed out half way through a scheduled tour. Apparently R Kelly was maced by one of Jay-z body guards.