Greatest Hits is a greatest hits album by American rock musician Lenny Kravitz, released on October 24, 2000. The album featured an unreleased track for promotion called "Again" which became a hit, reaching number 4 on the Billboard Hot 100, following a very successful string of hits from the album 5. Kravitz reported in an interview for VivaMusic.com that the selection of the songs were led by his record company, Virgin Records, which only chose the songs that were successful on the charts. The tracks were sequenced by Kravitz's engineer, Henry Hirsch. The album reached #2 on the Billboard 200 and #12 on the UK Album Chart. As of March 2008, Greatest Hits has sold 4.5 million units in the U.S, approximately 21 million in worldwide sales, the biggest selling album in Lenny's career to date. The album is amongst the top-selling albums of the decade. This album has been released with the Copy Control protection system in some regions.