"No matter how many hit songs she had, and no matter how incredible her concerts were - and he was always the first one there, applauding, kissing her, being in the front row - after every show, he would say, 'Ariana you know what song you have to sing?"
She closed the three-hour-plus event with a cover of "Over the Rainbow", crying onstage at the song's end as the audience cheered her on.
After he left the stage Miley performed her song Inspired, after telling the crowd: "Manchester I just had to take a second to look around at all of you".
But there was also a jovial atmosphere, as police officers and security guards danced with music fans.
Perhaps the most emotional moment of the evening happened when Grande joined the Parrs Wood High School Choir for a tearful performance of "My Everything". "I was paying homage and showing love to London and Manchester...#UKlove #whereIStheLOVE truly?" "Let no one take that away from you", she said. A tearful Justin Bieber led the crowd in a tribute to those who lost their lives at Ariana's Manchester Arena concert.
"(God) loves you and he's here for you.
"I think the kind of love you're displaying is the kind of medicine the world really needs right now".
Apart from that, the singer also belted out her hits "Break Free", "Side to Side", "Be Alright" and "The Way" with her boyfriend Mac Miller. A teary eyed Robbie Williams, Ariana herself chose to have boyfriend Mac Miller performed a duet, but it was Justin Bieber's emotional speech and break down that has our attention.
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His performance was followed by a video message from U2's Bono before Pharrell Williams took the stage to perform his Daft Punk collaboration Get Lucky. "All we feel here tonight is love, resilience, positivity", Williams said before he launched into his hit song, "Happy" with an assist from Miley Cyrus.
The producer/rapper was quick to quash the rumours that he mistook Manchester for London.
"Our thoughts are with everyone who has been affected by this", singer Gary Barlow said.
Thank you. I want to thank you so much for coming together and being so loving and strong and unified.
"And this is so lovely, you guys made that decision, you looked fear right in the face and you said "no we are Manchester and the world is watching".
A sell-out crowd of 50,000, many of them clutching "For our angels" signs, fell silent for a minute before Mumford & Sons frontman Marcus Mumford opened the show.
There was an overwhelming feeling of strength and unity at the One Love Manchester concert yesterday, and there was one group of people in particular that were shown fantastic support as they arrived at the venue.