The architectural historian Victoria Newhouse, author of the new book Site and Sound: The Architecture and Acoustics of New Opera Houses and Concert Halls, looks in on various performance spaces around the world in the video tour above. Site and Sound, which emerged from four years of research and travel, will be a crucial resource for anyone assessing the state of the hall-building art: I was particularly fascinated by the overview of all the frenzied recent activity in China. I should disclose that I know the author and shared a rowboat with her during Xenakis on the lake.