We rate Xenoblade Chronicles X very highly here at Nintendo Life, and the odds are good that many others with the game now do likewise. It's a hugely impressive achievement from Monolith Soft and a strong showcase for Wii U in many respects, including its soundtrack.
We think the soundtrack for this game has some notable high points, though some aren't fans and compare it unfavourably to that of its predecessor. We'd argue that some of the modern genres and styles used regularly in the game fit well with the aesthetic and setting of this game but, ultimately, opinions are varied.
This entry does have some calmer tracks, however, and also dramatic orchestrated moments. Nintendo has shared a couple of these tracks on YouTube, with some lovely music playing as quotes from those behind the ost are also shared. Pop in some headphones and have a listen.