'Changes' by Tupac Shakur - Originally recorded in 1992, 'Changes' features in Tupac's 'Greatest Hits' compilation released posthumously, but it was never included in an album.
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'Live It Up' by Jennifer Lopez - J.Lo teamed up with Pitbull and released 'Live It Up' in 2013. It was a huge hit but was nowhere to be found on a Jennifer Lopez or Pitbull album.
'Focus' by Ariana Grande - 'Focus' isn't included in the original release of Ariana Grande's third studio album, 'Dangerous Woman.'
'T.H.E. (The Hardest Ever)' by will.i.am - This tune, featuring Mick Jagger of The Rolling Stones and Jennifer Lopez, was never included in an album.
'Pretty Girls' by Britney Spears and Iggy Azalea - This collaboration between Britney Spears and Iggy Azalea did pretty well as a single, but the song was never included in an album.
'Timebomb' by Kylie Minogue - Kylie Minogue's hit 'Timebomb' was released in 2012 as a single and not included in an album, other than compilations and box sets.
'Gambler' by Madonna - 'Gambler' is part of the soundtrack of the 1985 movie 'Vision Quest.' It was never included in any of Madonna's albums.
'This Groove' by Victoria Beckham - Released as a single in 2003, 'This Groove' was originally recorded for Victoria Beckham's second studio album, which was never released.
'The Only One I Know' by The Charlatans - This song was eventually added to the reissue of their 1990 album 'Some Friendly,' but it was not included in the original version.
'Two More Years' by Block Party - This single came out after the band's debut album 'Silent Alarm.' It was such a popular tune that it was later included in a reissue of the record.