Dropping a note here about the reading of 夜想曲, more for my own benefit than anything else because I've already looked this up at least once in the past.
The PS1 box explicitly says the
game title is
yasoukyoku:
However, the
album title is
nocturne, as seen on the spine:
Likewise, for the
song with the same title, the sheet music page in the booklet indicates its reading is also
nocturne: