 A few months earlier, Warner Bros. had also released "", a collection of unreleased material recorded by Prince throughout his career.The pay-per-view concert, "Rave Un2 the Year 2000", was broadcast on December 31, 1999, and consisted of footage from the December 17 and 18 concerts of his 1999 tour.The concert featured appearances by guest musicians including Lenny Kravitz, George Clinton, Jimmy Russell, and The Time.