Yes I've finished The Way and played Everlong, although not completely, and those pieces were most likely taken directly from those games after I played them. In fact, "Cirigoth" is a name from Everlong and I never bothered to change the filename, and as far as I can remember, that song is not actually even used anywhere during my game. There were a lot of music files that I imported into my project for consideration over the years, but in the end many songs were not used. I deleted the ones that took up large filespace, but I left many of them in there, just in case I did use them and forgot about it.
Also, just to let you know, a lot of the filenames are misnamed, since some were originally intended as a theme for something, and then later replaced or used for some other part of the game.
One of my favourite pieces and a late addition to the project is FF5_MyHome which I think is one of the most underrated songs in the FF5. There have been many vocal versions and remixes of this song and they all sound incredible. If I ever make the prequel to this project, I would definately use one of the vocal versions of this song as a theme. But sadly, it will probably never happen.