The Sky Moves Sideways

The Sky Moves Sideways is the third studio album by British progressive rock band Porcupine Tree, first released in February, 1995. It has been compared to Pink Floyd's Wish You Were Here because of their similar structure; both albums have extended pieces at the beginning and end, which are the halves of a single song.

The Sky Moves Sideways was the first Porcupine Tree album to be released in the US, and the first on which Porcupine Tree was actually a band rather than simply a pseudonym for Steven Wilson. This transition took place while the album was being recorded, so two of the tracks - namely "The Moon Touches Your Shoulder" and "Dislocated Day" - are performed entirely by Wilson, while the full band appears on the remainder of the album (including "Stars Die", a UK single which was added to the US version of the album).

In 2004, a new, two CD version of The Sky Moves Sideways was released, along with a similar re-release of the previous album, Up the Downstair, featuring newly recorded acoustic drums by Gavin Harrison on tracks which previously had only drum machines and other electronic percussion programmed by Wilson.

There are thus three distinct versions of this album - the original UK version, the US version, and the 2004 remaster - no two of which feature the same track list, or the same version of "Moonloop".