That was released in the west under the name “Sukiyaki” for roughly the same reason that the first Harry Potter book was released with the title “… and the Sorceror’s Stone” in the US, but we don’t have to keep playing along. (I rather like the column written in Newsweek at the time that it’d be like releasing Moon River in Japan under the name Beef Stew.)
It appears to need to be both familiar with the tune, and strumming is not too hard (or I can adapt the chords). In some cases, I can guess the notes, so piano or picking
There are only two songs I can play right now. The first one is in my profile (for ages), the second one is secret base~君がくれたもの~ (from a lv 60 post).
Amazing that the song reach number 1 on the charts without anyone being able to understand the lyrics. Its sad and haunting nature transcends language, I guess.
Wikipedia has a list of eight songs that hit number one on the charts despite not being in English. “Sukiyaki” is the second. (And, right underneath, a list of twenty-five songs that hit number one with no lyrics at all.)