I sounds like a pretty familiar hum, I've been to lots of remote areas so if this is common enough I may have heard it at some point. This phenomenon reminds me of the ability for radios in the desert or very remote areas to be able to literally pick up the sound of the planet Jupiter if you tune into a certain frequency.
Either way, New Mexico always has so many weird things associated with it, this Taos Hum thing certainly adds to that list.