Lorde had a moving message for the the Muslim community of Aotearoa during her special guest appearance at the You Are Us/Aroha Nui Christchurch concert.
"Holy moly, this is such an incredible thing to be a part of," she told the crowd. "I want to say how moved I've been by what I've seen in Christchurch this last month.
"To our Muslim community, to our brothers and sisters, you have been so strong, and so resilient, and so graceful and we are with you.
"This is our way of standing beside you, from here on out."
New Zealand's most famous musical export to took to the stage at Christchurch Stadium with Marlon Williams and Bic Runga, performing two songs.
Williams joined the Grammy winner for a soulful duet of Simon and Garfunkel's iconic song 'The Sound of Silence', while Runga joined the Grammy winner for a stripped-back version of Lorde's hit 'Team'.
The 22-year-old singer called the opportunity to perform at the unprecedented fundraising gig "an honour".
Lorde has kept a low profile since she finished touring last year, but appeared on a star-studded line-up that included Six60, Dave Dobbyn, and over 25 fellow musicians on Wednesday night.
Sharyn Casey and Kanoa Lloyd, who hosted the television broadcast of the event, said Lorde had brought tears to those who witnessed her sound check earlier in the day.
Christchurch Mayor Lianne Dalziel said the response of the New Zealand music industry to the shootings on two mosques last month has been "magnificent".
"The impact on our Muslim communities has been huge and they are going to need ongoing support for a very long time," she said in a statement.
"We are all grateful for the significance of this contribution to the Muslim community's long term recovery."
All proceeds from the concert go to the Our People, Our City fund set up to help those affected by the Christchurch shootings, which left 50 dead and 50 more injured.