Dream -- sometimes referred to as Dream (When You're Feeling Blue) -- is a jazz and pop standard with words and music by Johnny Mercer in 1944 and performed by many artists. The most popular versions of the songs include those by The Pied Pipers, Frank Sinatra, Michael Bublé and Roy Orbison.

For Capitol Records, The Pied Pipers, with lead singer June Hutton, made a version of Dream which became a major hit in 1945. The Pied Pipers would revive this ballad in the 1955 Fred Astaire-Leslie Caron musical film, Daddy Long Legs.

Dream was also recorded (on April 14, 1958) by Betty Johnson (issued by Atlantic Records as catalog number 1186) in a version that spent one week on the charts: #19 on the Billboard chart of songs most played by disc jockeys and #58 on the Billboard top 100 chart. Roy Orbison included a cover of the song on his popular and critically acclaimed 1963 album for Monument Records, In Dreams. More recently, Orbison's version was resurrected for the soundtrack to the 1998 film, You've Got Mail.

Other notable versions include a best-selling single by Frank Sinatra on Columbia Records in 1945, a rendition from blues legend Etta James in 1961, Ringo Starr's version in 1970, and most recently Michael Bublé's version in 2007.

"Dream" is the fifth single from British rapper Dizzee Rascal and the second from his second album Showtime. The single became his fifth top forty hit and second consecutive top twenty hit in the UK Singles Chart peaking at number fourteen, his second highest charting single. "Dream" became his longest running single to chart in the UK singles chart, spending eight weeks inside the top seventy-five.

"Dream" contains a prominent sample of Captain Sensible's "Happy Talk".