The track is the latest single to be shared from his upcoming album
Other acts on the bill include Róisín Murphy, Future Islands and Slowdive
"I had a lot of fun putting my own unique spin on this timeless Christmas classic. Hope you all enjoy it!"
The twin site festival will return on August 23-25
From early pioneers including Samuel Coleridge-Taylor to modern-day greats Little Simz and Stormzy
Smith sang 'Falling or Flying' and 'Little Things' on the show
Smith also performed her single 'Little Things'
On her second album – featuring dancefloor heater 'Little Things' – the Walsall-raised star finds her rhythm with an expanded sonic palette
The performances will take place every Monday through Thursday for the entire month of October
"I’m in my little alternative bag, but I’ve always kind of been in it"