First thing
"Beware the Umbrella Left There Forever" is track 5 and not 6, which is "Sky Ruin". Two different songs. I have no idea what happened there on your end~
Second thing
No, the japanese umbrella-fashion is not at all common here in Austria. It's not like it's not raining often here, but my family has had only two umbrellas which we are using since forever (at least 20 years). I personally have not even used an umbrella once in these 20 years, for whatever that's worth, as I like the rain a lot.
...considering how few our umbrellas are used, couldn't they be called "left there (in a corner near the exit) forever" as well?
It's a shame really, because I like umbrellas a lot - not for their use but for their looks. Yukari, Yuka and Kogasa might or might not have played a vital role in creating this mindset of mine.