Much of the setlist is from her album Wounded Rhymes, written in the aftermath of a romantic breakup, and the on-stage mood accordingly swings between defiance and disbelief.
When the band take the stage, the mood is celebratory.
This is the final battle for those vital 4 million undecideds; hearts and minds more likely swayed at this late stage by mood music than by weighing up the broad probability of greatest risk.
Once they reach the stage, the mood changes as he picks up a guitar and they launch into By a Thread, the first of their pained duets about broken relationships, cheating and hurt.
As the lush string arrangements fill the air and Turner and his doe-eyed sidekick take the stage, the mood is decadent, melodramatic, and has a sense of impending catastrophe.
At that stage the mood around the Memorial Ground was one of disappointment, but as Watkins and then Helu added tries, desperate hope was restored that a late fightback could be on.
Give me a second, yo," Bieber continued, as he bent down to wipe the stage, his mood still in check.
But as soon as Ferrera, Dunham and the former first daughter took the stage, the mood became a bit more serious.
The multivariate model kept CHIKV infection, comorbidity and acute stage depressed mood as independent prognostic factors for both arthralgia and arthritis, but found early chronic stage RD as the main determinant of the same RD two years later.
One of the splendours of the Open Air theatre since Sheader took over has been lighting (here by Tim Mitchell) which sweeps the stage with moods and transports the audience from their damp seats.
Indeed, one could revisit this performance countless times and continue to sit in awe of the skill with which this veteran of the Chicago and New York stage shifts moods, demanding in turn that we alter our perspective on a mother (and addict) who is at once predator and prey, envenomed and victimized.
