We were fortunate enough to get in to see one of the free lunchtime concerts in one of the concert halls. We showed up at least 45 mins. before the performance and there were people lined up already. The concert hall was beautiful, such wonderful architecture. We also booked a guided tour for after the concert that lasted about 90 mins. Very worthwhile doing. We got access to areas not open to the public and our guide provided us with the history of the building. He was entertaining and informative. Would recommend both the free concert and the tour.