One cool thing to note about the Canto themes is that, for most battles, the soundtrack is dynamic, switching tracks around depending on the situation for example, the first enemy/boss you encounter that uses the F1 theme, also starts using F2 on the latter half of the fight, right as it starts charging a really strong attack also saw another person comment, but I highly recommend also listening to the main themes and boss themes! they're really cool
While limbus' and ruina's ost are nice, I heavily reccomend the boss fights/main themes of the games, here are a couple suggestions if you're interested: Library of ruina: string theocracy, Children of the city, Roland Realization, Angela Realization Gone angels, From a place of love, Iron Lotus, And then is heard no more And from Limbus: In hell we live lament, Between two worlds and finally Fly my wings!