That's very good mood music, @greenpea @it's based on a music principle that Beethoven started, one of self expression, and of subtlety that Rachmaninoff used, if you listen to Rachmaninoff's 2nd symphony, it's rich with that sort of subtlety.
I used to write a lot of mood music, and am being encouraged to do it again. It's been some decades since then.
I definitely like the prosody in that song - the art and skill of putting words and music together - often people don't do prosody well in modern popular music, because they don't think about what musical and vocal sounds go together and that there's a science called musicology that's very applicable in that.
