However , due to problems with the audio system , several thousand people were unable to listen to the music and left the concert early .
The audience of around 180,000 set a European audience record for the one , non-free event for a single artist .
Due to problems with the audio system , several thousand people were unable to listen to the music and left the concert early .
The audience of around 180,000 set a European audience record for the one , non-free event for a single artist .