The Dopamine Rush (a.k.a. 23) is the eighth track on Eric Leeds' first album Times Squared, and, around the time of the album's release, The Dopamine Rush was available as the album's first promotional release in the USA (with no commercial release).
The track is made up of portions of 21-24 (The Dopamine Rush Suite), an instrumental track recorded during sessions for Madhouse's third album 24. The suite is made up of four pieces (21 (The Dopamine Rush), 22 (Amsterdam), 23 (Spanish Eros) and 24 (Orgasm)), but was intended as one continuous track. Basic tracking took place in late July 1988 at Townhouse Studios, London, England, while on the Lovesexy Tour. Prince worked on the track further on 23 August 1988 at Medley Studios in Copenhagen, Denmark, before Prince asked engineer Chuck Zwicky to extend the track by repeating the underlying drum pattern over four separate pieces. On 10 and 11 December 1988, Prince added further instrumentation and vocal samples, with Eric Leeds adding saxophone and flute on 11 December 1988 at Paisley Park Studios in Chanhassen, Minnesota. The track was included as the fifth and final track on the album 24, before the album was abandoned. In August 1989, Prince asked Eric Leeds to compile tracks from the vault for a third Madhouse album. A track was compiled by Eric Leeds using portions of 21 (The Dopamine Rush) and 24 (Orgasm), and, in keeping with previous Madhouse releases, tracks were given tentative numerical titles of 17 to 26 (the album would be titled 26) - this track was given the title of 23 as the seventh track on the album at the time. When Prince suggested the album should be released as a solo album by Eric Leeds, Leeds came up with titles for each track, in Spring 1990; this track became known as The Dopamine Rush and the album became known as Times Squared.
The Dopamine Rush includes some phrases spoken in Dutch, but the full suite contains segments spoken in French, Dutch and Swedish, as well as a part in Spanish that was not newly recorded, but in fact Apollonia speaking in Spanish lifted from Apollonia 6's In A Spanish Villa, as well as various moans by Vanity lifted from the unreleased Vanity 6 song Vibrator.