Thirteen-year-old Nina got the invite of her dreams after her passionate sing-along to Sigrid's songs.
Sound of 2018
Sound of 2018 winner Sigrid has debuted her latest track, the ballad I Don't Want to Know.
“It’s definitely different than what I’ve been releasing before but I think this one shows even more what type of music that I love,” the Norwegian singer told Zane Lowe on Beats 1.
It's on streaming services now
Music reporter, BBC News
Last night, the BBC's Maida Vale studios were invaded by a host of acts from BBC Music's Sound of 2018 for a special one-off gig.
Spread across two studios were Pale Waves, Not3s, Yxng Bane, Rex Orange County and the winner: Norwegian pop sensation Sigrid.
The 21-year-old exuded charisma, grinning her way through a powerful four-song set that included her musical mission statement, Raw ("I could never fake it") and the smash hit single Strangers.
Rex Orange County provided the night's only flute solo, in a virtuoso performance of Best Friend, while Yxng Bane turned Ed Sheeran's Shape Of You inside out via his vocally dexterous remix.
"This is my first time doing something like this," said Not3s as he took the stage - but wouldn't have known from his playful performance, which culminated in a loved-up duet with Mabel, complete with will-they-won't-they choreography (somewhat wasted on the radio audience).
The night reached its peak with a performance from Sound Of 2015 winners Years & Years, who played Take Shelter and King before surprising fans with DNA, a new song from their forthcoming second album.
An emotionally raw, stripped-down ballad, it sees Olly Alexander singing:
I'm gonna show you that history can change / The bad times in my youth / The cut on my DNA.
The star also promised there'd be more music from the band in "weeks, not months".
Check out some highlights below