Stockhausen's Oktophonie incites intergalactic panic attack at the Park Avenue Armory, New York

In the final instalment of aus LICHT, the Helicopter String Quartet lives up to the publicity hype and choirs perform marvellous feats.

The second day of aus LICHT is one mesmerising highlight after another, including the Netherlands Youth and Children’s Choirs in one magical and one sinister procession.

The performers in Part 1 of aus LICHT at the Holland Festival are amazing, but the production doesn’t rev up until the Archangel Michael goes on his dizzying world tour.

All credit to the Barbican for showcasing Stimmung and Cosmic Pulses.

Tonight’s Stockhausen Prom was in equal parts sonic experience and performance.In an introduction to a performance of Gesang der Jünglinge in 2001, Stockhausen proposed that “if you close your eyes every now and then, you might even see these angels”. In a concert performance this isn’t an empty suggestion; Gesang der Jünglinge is a truly acoustic experience.