"Machines" is a song by Scottish band Biffy Clyro, from their 2007 album, Puzzle. It was due to be released as the fourth physical single from Puzzle on 1 October 2007 but was pushed back 1 week and released on 8 October 2007. The "Alternate Mix" was released on iTunes on 30, 1 September day earlier than expected. The "Rock Version" can only be bought at Recordstore.co.uk and also has alternate lyrics to the album version.