Guitar was the first single to be released from the album Planet Earth, by Prince. It was released in Europe a week before the album was included free with the UK/Ireland newspaper The Mail on Sunday (see Planet Earth for details), and was not released elsewhere in the world.
An alternate version of Guitar (often inaccurately referred to as a demo), was released on 3121.com five months earlier, to coincide with Prince's appearance on the Super Bowl XLI halftime show, and is included here for clarity's sake, although it could also be considered a separate release.
On 31 May 2007, the song Guitar was available for free download through Verizon Wireless' VCast program - although it is not directly linked to the single release, it is included here for clarity's sake.
The single charted poorly in several countries in Europe, reaching top 20 position only in the Netherlands and Italy.