https://www.nytimes.com/2019/01/17/arts/music/stradivarius-sound-bank-recording-cremona.html, posted Jan '19 by peter in art audio history music
On Jan. 7, the police cordoned off the streets. The auditorium’s ventilation and elevators were turned off. Every light bulb in the concert hall was unscrewed to eliminate a faint buzzing sound.
Upstairs in the museum, Mr. Cacciatori put on a pair of velvet gloves and took a 1615 Amati viola from its glass display case. He inspected it thoroughly, and then a security guard escorted him and the instrument down two flight of stairs to the auditorium.
The curator handed the instrument to Wim Janssen, a Dutch viola player, who walked to the center of the stage.