Song X is a free jazz album by Pat Metheny and Ornette Coleman. The album was recorded in two days in December 1985 and released in March 1986 by Geffen Records. The album also features mutual Metheny/Coleman collaborator Charlie Haden on bass, Jack DeJohnette on drums, and Coleman's son Denardo on various percussion instruments. A remixed and remastered version was issued on CD in August 2005, titled Song X: Twentieth Anniversary. Six unreleased tracks were added prior to the original eight songs.