At this year's Donaufestival in Austria, Tristan Bath puts together a list of salient points – courtesy of performances from Klara Lewis, Gnod, Emptyset, Ben Frost, and a host of others – on topics from set times to politics and its absence. (Photographs by David Visnjic)
American composer George Antheil – the self-proclaimed "bad boy of music" – was a pioneer of sound who had a shot at the big time and blew it. But he found a place in history, putting into practice a trailblazing invention by "the most beautiful woman in the world", Hedy Lamarr
As David Stubbs wheeled his son's pram past the US embassy he chanced upon a brown manilla envelope of the CIA transcripts of surveillance of top rock band U2 in advance of their singer Bono's friendly chat with President Trump's dastardly assistant Mike Pence
Thirty years on from its release – and with the band’s popularity in question more than ever – Wyndham Wallace returns to The Unforgettable Fire, U2’s incendiary denial of expectations and their first encounter with producers Brian Eno and Daniel Lanois