2012 Rerelease
In May 2012, Steven Wilson of Porcupine Tree remixed the album for a 3-CD reissue containing the original mix, the Wilson remix, and a DVD-Audio with Wilson's 5.1 surround sound version and a higher-birate version of his stereo mix.
The remixed versions have different track listings from the original album, omitting the first two sections of "The Three Fates" ("Clotho" and "Lachesis") and "Tank" because the multitrack tapes for those pieces were unavailable, and adding unreleased material. "Knife Edge" has an extended ending; due to the difficulty of reproducing the song's original tape slowdown ending digitally, Wilson chose instead to include the end of the original album session at its original speed. The 5.1 remix replaces "Tank" with an unreleased instrumental called "Rave Up", which bears some similarity to the instrumental section of "Mass" on Tarkus.
The remixed stereo versions include all of the above while adding more unreleased material. A vocal version of "Promenade" (the first live version of which appears on Pictures at an Exhibition) replaces the missing sections of "The Three Fates"; a new otherwise untitled "Drum Solo" by Carl Palmer (similar but not identical to a section of "Tank") is added between "Rave Up" and "Lucky Man"; "Lucky Man" is followed by an unfinished alternate take of "Take a Pebble", complete with some studio banter; then an unreleased take of "Knife Edge", lacking vocals and final section; and finally two versions of "Lucky Man", the first being Greg Lake's original demo, the second an unreleased complete band version.
Read more about this topic: Emerson Lake & Palmer (album)