20 (A Girl And Her Puppy) (a.k.a. A Girl And Her Puppy) is an unreleased instrumental track recorded on 12 December 1988 at Paisley Park Studios, Chanhassen, MN, USA as the final track recorded during sessions for Madhouse's third album 24 (the day after saxophone and flute overdubs on 21-24 (The Dopamine Rush Suite)). The track was included as the fourth track on the album 24, before the album was abandoned.
On 21 January 1991, Prince submitted the track (now re-titled A Girl And Her Puppy) to Miles Davis, along with Penetration and Jailbait, for his consideration. Prince wanted Davis to record additional trumpet parts before sending them back. Davis instead taught the three tracks to his band, and they recorded new versions of the tracks on 27 March 1991 in a German studio. The band also played them regularly on Davis' 1991 tour. After Miles Davis died in 1991, Warner Bros. asked Prince to add some post-production to this track (as well as Can I Play With U?, Penetration and Jailbait) to include on his first posthumous album, Doo-Bop, but Prince was not interested in contributing to tracks that he felt didn't show Davis at his best. As the original Madhouse version remains unreleased, the Miles Davis version is included here instead of being considered straight cover versions.