My immediate thoughts exactly - the bigger the object, the lower the frequencies will need to be to generate wavelength-nodes large enough for them to get trapped in - at which point you'd be looking at some serious displacement - and the (I suspect) electrostatic units they're using would readily need to be replaced with (ever-larger) traditional diaphragm-construction loudspeakers - which are incredibly inefficient with regards what input (electrical) power actually gets converted into soundwaves.
So really, the current employment of electromagnetic tech (like that in the maglev) is already a more refined concept (in that it forgoes the lossy sound-making part) - so as interesting, and fun, a concept as it is - it's smacks a little of scientific fancy.
Also, the video is horribly misleading to suggest they were using Strauss to do any of that - in truth it would have been one, or a harmonic range of, monotone(s).
