A so-called techno event, Audio Obscura, at Amsterdam’s classical temple Concertgebouw ended prematurely Thursday night, because the ceiling above the stage became unstable. According to the Concertgebouw’s management, the ceiling consists of quadrants that are framed with stucco. One of those has come loose and some gravel was falling down. It will be investigated whether the loud music and penetrating bass sounds were responsible for the deterioration.