|A Celebration is an unreleased album by Prince, announced on NPG Ahdio Show # 4 (released 15 May, 2001). The announcement stated that Prince was in negotiations with a major record store chain to distribute the album, said to contain 20 "remastered re-recordings" of Prince's greatest hits, along with "at least four brand new songs". This album was not released, however (likely due to the Warner Bros. release of The Very Best Of Prince in July, 2001).
It is not known which songs would have been included on the album, and how much the tracklist overlapped with the setlists used on the brief A Celebration tour, which was likely initially intended to promote the album, but was cancelled after only six concerts (partly to avoid the appearance of supporting The Very Best Of Prince, and partly because of Prince wanting to spend time with his father, whose health was ailing at that point).
It is possible that one of the new tracks was U Make My Sun Shine, which had already been released as a single, but this is purely speculative. It is possible that one of the "remastered re-recordings" included on the album would have been 1999: The New Master, which had been released as a single in 1999, but during the years following the end of the year 1999 Prince viewed the song as "retired" (not playing it live), making its inclusion unlikely.