ITUNES FESTIVAL: Sigur Rós + Poliça

Distinguished by the astonishing, crystalline voice of frontman Jónsi Birgisson, the Icelandic post-rockers play from their new album 'Kveikur' at the iTunes Festival. It's their second full-length release in two years, and showcases a heavier, crunchier take on the band's epic, neo-classical soundscapes. They're supported by hotly tipped, vocoder-heavy Minneapolitans Poliça, with their seductive blend of trip hop and synth-pop. Win tickets on the iTunes Store, via www.itunesfestival.com.