Recently reformed eight-piece Godspeed You! Black Emperor are the latest act confirmed for ATP's I'll Be Your Mirror, taking place from 23-24 July at Alexandra Palace, London.
They join PJ Harvey, Caribou and more on the line-up for the festival, which will be curated and headlined by Portishead.
Graphic novelist Alan Moore and Stephen O’Malley are also set to perform, providing text and guitar for an expanded soundtracking of the animated film, ‘Heaven & Earth Magic’.
The new additions will play on Sunday (24 July), joining Grinderman, Swans and Beach House.
Tickets are on sale now at £59 for one day and £100 for both.