The name Portishead in the headline here is little less than a MacGuffin. Because yes, they’re the makers of this selection (if ATP say so, we believe them - although it could as easily have been picked by an intern with the line-up to hand), but their own music, except for the solitary “We Carry On”, doesn’t appear anywhere on the tracklisting. Instead, it’s a good way to bring our attention to the new ATP festival being held in London. I'll Be Your Mirror will take place on 23rd and 24th July at Alexandra Palace. Portishead have curated the event, and this mixtape, at almost two hours long, is a sample - an overview - of some of the bands Geoff Barrow, Beth Gibbons and Adrian Utley have selected for the festival. Here’s a window into the musical tastes of Portishead.