Guitar is the second track from Prince's 32nd album Planet Earth, and a week prior to the album's initial release (with the Mail on Sunday newspaper in the UK and Ireland), Guitar was released as the album's first single in Europe.
Five and a half months prior to the album's release, however, a completely different version of Guitar (often described as a demo, although not officially labeled as such and most likely recorded years after the version as it would appear on Planet Earth), was available for purchase as an mp3 download from 3121.com to coincide with Prince's appearance on the Superbowl Half-Time show on 4 February 2007.
Additionally, six weeks prior to the album's release, the album version of Guitar was available for download on Verizon Wireless in the USA, and a short promotional clip of Prince and his band performing the song was used in TV advertisements.
In 2011, new bandmember Andy Allo posted on her Facebook page the track Guitar (Acoustic), seemingly a rehearsal take of the track, recorded only with Prince and Allo (complete with Prince giving direction to Allo). Interestingly, the meta-data of the track gives the artist credit as "Prince/Allo", and gives an album title of "The L/C", about which nothing is known. The artwork embedded in the track also gives the credit "Prince/Allo", while the artwork's photo is a picture of Prince lifting up Allo's guitar (see artwork below).
The song was also offered as a free download at ThisIsRealMusic.com.
Basic tracking took place on 19 November 2004, during the three-and-a-half hour session that also yielded 3121, From The Lotus..., ...Back 2 The Lotus, Colonized Mind, Love Like Jazz, Wall Of Berlin, Planet Earth and a song titled Shameless as well as two or three others.
A tape photographed in Prince's vault at Paisley Park Studios lists Wall Of Berlin as 19 November 2004, which alludes this is the exact date for all of the songs in this sessions.
In an August 2006 interview, Michael B. said they recorded eleven or twelve tracks in three and a half hours that night. On a different occasion he has later indicated that this was the last recording sessions they did with Prince for a while after that. The Prince solo version is believed to have been recorded in early 2007 at either Paisley Park Studios in Chanhassen, Minnesota or at 3121 at The Rio in Las Vegas, Nevada. A recording date for the 2011 rehearsal between Prince and Allo is not known, but assumed to be in July 2011, while on the Welcome 2 America Euro 2011 Tour in Europe.