How to know when I've heard every track in the OST

[tulsa1990]

I want to give the whole soundtrack a listen, but I don't want to get spoilers from music I haven't heard in-game yet. Any tips? (For reference, I have heard Final Voyage and seen the credits)

[CrazyJayBe]

https://youtu.be/JPyaFR7poL4?si=WRBkHBuo96qz5qzG although I'm not sure how a soundtrack could spoil its media...

If I loaded up the soundtrack to Terminator, would you know what movie it was from? Or why he's called The Terminator?

[Bobywan]

I don't really see spoilers in the soundtrack.
There is one title which may be considered minor spoiler, it's a duration, when you play the game, you'll understand what that duration is.
Otherwise, lots of location have their soundtrack associated, so you have a soundtrack for each planet etc.

[Tacitus]

I got the ending spoiled because I looked up the soundtrack, read the track titles, and from them was able to guess how the story concluded. So OP is wise to be cautious.

If you've seen the credits (the non-kazoo version, that is), it should be safe to enjoy the OST. Just be careful listening to it on YouTube, you might see recommendations for Echoes of the Eye music and see some spoiler-y track titles there.

[Songbird]

If you have finished the story without cheating or making some extremely wild blind guesses, there are only a couple pieces of music you can miss. They are associated with optional areas that are not related to the main story puzzles, and perhaps a couple areas that are related to these puzzles but have information that can reasonably be guessed from experimentation. If you have completed the ship's log, you're completely safe (outside of DLC spoilers as mentioned above.)

The spoiler below should be safe for anyone who has finished the game, but may describe a bit much of the game for a new player:
The main things you can miss that add to the story in a significant way and have their own music are related to the "quantum fluctuations" signal, as well as the interior of two objects orbiting the sun that are not the main planets. It is also technically possible to skip extremely large portions of Brittle Hollow that only add to the background of the Nomai and aren't needed for endgame puzzles, but it's very unlikely because of how easy they are to find. If you have explored all of these to their conclusion, anything else you missed is probably some very minor site that isn't going to be spoiled by the soundtrack.