Joining Barnett on stage during her set at the festival’s Belfast site on Friday (May 25), Kim and Kelley Deal helped out on the track from Barnett’s new album ‘Tell Me How You Really Feel’.
You can watch a clip of the performance below.
It’s not the first time the two acts have worked together, as Barnett provides backing vocals on Breeders track ‘Howl At The Summit’ on their latest album ‘All Nerve.’
Speaking to NME earlier this year, Barnett discussed her latest album and how writing music helped her battle with anxiety.
She said: “I think [anxiety] is a constant in my life. I’ve always had a melancholic feeling since I was a kid. It doesn’t really have a beginning and nothing was wrong in my general life. I guess it just crept in.
“It’s all about playing with your behavioural patterns and changing negative energy into positive energy.
“Eventually, I came to the conclusion that I’m small and insignificant and that the best thing to do is take small steps each day.”
Billed as the event to fill the void left by Glastonbury this year, The Biggest Weekend sees four of the BBC’s radio stations take over different sites across the UK this weekend.
Radio 1 has taken residence in Swansea, with acts including Ed Sheeran and Taylor Swift topping the bill, while BBC 6 Music has found home in Belfast with Barnett among acts including Beck, Father John Misty and Manic Street Preachers.
Elsewhere, Radio 2 and 3 are based in Perth for the weekend and all four stations are represented in Coventry.
Yesterday, speaking to NME at the festival, George Ezra revealed the advice he was given by Ed Sheeran and Elton John.