Celine has problems singing upbeat... exactly same as Streisand who had that fixed in her disco times... all great Belters have problems singing fast upbeat (besides Whitney)
To be honest i would disagree on that duet just cause Celines voice makes me cringe. shes a marvelous woman dont get me wrong just cause i say that doesnt mean i hate her i still like her but her music just isnt my cup of tea. :(