This is one of the great delights of the National Gallery, and a work of art in and of itself. Rideau Street Convent Chapel once stood in a downtown convent here in the city. While the convent was demolished, the Chapel was saved and reconstructed here in the National Gallery. It is a beautiful space inside, and there was an additional element- forty or so speakers set up around the room, with the recording of a choir singing religious music. Standing by one would let you hear the individual singer over the rest of the choir, while the centre of the room offered the unanimous sound of the choir. The overall effect was very soothing, almost like immersing in the music itself. I had considered a video recording, but the Gallery's relaxation of rules about photography do not extend to video. Trust me, the acoustics in this room are exquisite.