"Computer Blue" is a song by Prince and The Revolution. Released on June 25, 1984, it is the fourth track on Prince's sixth album, "Purple Rain", which also served as the soundtrack to the film of the same name. In the film, the song represents Prince's character's angst at the budding relationship between the characters played by Morris Day and Apollonia, the latter of whom he desires, and he performs it in front of the two during The Revolution's set at a nightclub with the aim of upsetting them. The song was composed by Prince with credit to his father, John L. Nelson, for the guitar solo based on a piano instrumental written by Nelson and Prince. He titled the instrumental piece "Father's Song" and recorded it on piano for the film, though onscreen it was portrayed as being played by Prince's character's father, played by Clarence Williams III. On the box-set "Purple Rain Deluxe" (2017), a different and longer recording of "Father's Song" was included.