Musicians from some of the world's biggest bands attended the inquest of a worker from Doncaster who died in an accident at a Radiohead concert.
Drum technician Scott Johnson was crushed when the roof collapsed as he set up before the gig in Toronto, Canada, in 2012.
Radiohead drummer Phil Selway paid tribute at his inquest in Doncaster today.
He described Scott as a "lovely person, very sunny and very professional".
He added: "It came as a big shock and we still feel the loss."
Richard Hughes, from the band Keane, said: "Clearly something went wrong very badly and it's incumbent on all of us to make sure it's not swept under the carpet.
"And we need to make sure that everyone who works in this kind of thing is safe."
Recording a narrative verdict, the coroner Nicola Mundy said that "inadequate technical advice" and "wholly inadequate construction techniques" were responsible for Scott's death.
A court case against the entertainment company who organised the 2012 gig was halted in 2017 because of delays.
Following today's inquest, Scott's father Ken welcomed the coroner's comments. He said: It's exactly what we needed someone to say. At least that information now should help people to acknowledge the negligence."