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Oxygen is paramagnetic, but I think you would need a VERY powerful magnet to produce noticeable effects on the air. Water has an electrostatic dipole moment, so its (gas phase) motion might have some degree of interaction with a powerful magnetic field, but I still don't think this could account for any action of a magnetic field on ultrasound in air...
I was looking at this and wondering if strong enough magnetic fields can manipulate sound waves.http://archive.news.softpedia.com/news/Magnetic-Fields-Can-Be-Manipulated-with-Soundwaves-53402.shtml
As a medium? And if so in what ways? Can you give me some examples?