It's not classical music, per se (unless one considers nature sounds, which pre-date man-made music, the most "classical" music of all... lol), nor does Mt. Isa in the title refer to the famous ore deposit, but rather presumably to the landscape around the town build to exploit it.

So what do the relaxing hot westerly winds of Mt. Isa sound like? There's surprising more sounds of water than I recall and that one might expect from an arid community, but there are also no sounds of mining activity coming from the mine itself (the mine is on the west side of town, from where these "hot winds" are coming from) ... those wouldn't be relaxing, I suppose?

As an aside, I don't think Stanley Fields must have ever lived in Mt. Isa. When the winds did come from the west, the smell of sulfur from the smelter stacks hung over the town, and I always wondered how high everyone's blood Pb levels must have been. It's a stark and very beautiful area, but "relaxing" may be a bit subjective... heh heh.

Arthur Honneger: La traversée des Andes  

 It inspired also a modern classic, Pink Floyd's Fingals cave