How can sound of certain frequencies and intensities break glass panels?

A given piece of glass, like all mechanical systems, has a characteristic resonance frequency. And it is rigid. There will be one frequency that the glass will "like" and it will dance to it (vibrate) if it feels this particular vibration. And because glass is rigid, the pane will respond as a whole to the stimulation. If the intensity (amplitude) of this signal is increased, the glass will respond with increased vibration. If the amplitude is sufficient, the sympathetic vibration of the glass will cause it's structure to fail. It would be hard to get a wooden wall to fail like this because the wood isn't as rigid, but is it possible to get different sections of a wall to vibrate with a big set of speakers and a heavy amplifier that is driven by a signal generator. But that's something that might very well be within your experience already. If it is, that's a good thing. Personal experience could be seen as falling into the category of observed data. And it helps set the stage for the moment of inspiration, that point in time where the light comes on and something that has been seen is coupled with scientific fact(s) and understanding emerges. Ooooo! Snap! That's why when I saw that it happened like it did!