The album was produced by David Foster, Christopher Neil, Tom Keane and Andy Goldmark.

Upon its release, Unison received generally positive reviews from music critics, who complimented Dion's voice and technique, as well as the album's content.

"Where Does My Heart Beat Now" became a top five hit on the Billboard Hot 100 in the United States, reaching number four.

Dion topped the Quebec chart with hits like "D'amour ou d'amitié", "Mon ami m'a quittée", "Incognito", "Lolita (trop jeune pour aimer)", "Comme un cœur froid" and "D'abord, c'est quoi l'amour".

In France, Dion became the first Canadian artist to receive a Gold record for her top ten single "D'amour ou d'amitié".

First, Dion performed a duet with Dan Hill on "Can't We Try" at the CBS Canada 1987 convention.

The performance impressed the company's president Bernie DiMatteo enough for him to raise the budget to $100,000 so that some new songs could be commissioned.

Neil produced three singles on the album, including the successful "Where Does My Heart Beat Now" and a cover of Sheena Easton song, "The Last to Know".

His production work included "Have a Heart", which was originally recorded in French for Dion's 1987 album, Incognito.

Andy Goldmark produced the cover of Junior's song for the Tom Cruise movie, All the Right Moves, "Unison".

[1][2] In other parts of the world, Unison was issued on 21 February 1991 in Japan, on 4 March 1991 in Australia, and on 16 September 1991 in the United Kingdom.

"Where Does My Heart Beat Now" peaked inside the top forty in Ireland, France, Belgium, Netherlands, and New Zealand.

The album was largely influenced by the 1980s soft rock sound that was a fit for the adult contemporary radio format.

Unison hit all the right notes with most critics: Jim Farber of Entertainment Weekly wrote that Dion's vocals were "tastefully unadorned" and that she never attempted to "bring off styles that are beyond her".

[5] Jan De Knock of the Chicago Tribune said that "though Dion's big voice invites comparisons to the power-pop stylings of Taylor Dayne and Laura Branigan...she also has a deft touch with an R&B groove".

[11] In the United States, it peaked at number seventy-four and has sold over 1.2 million copies achieving Platinum certification.

It did not initially chart in the United Kingdom, but eventually reached number fifty-five there in 1996 after the success of subsequent albums.

[22] "Where Does My Heart Beat Now" also won the ASCAP Pop Award for Most Performed Song in the United States.