all of it! the entire soundtrack! at least, what's intended as music - battle music, atmospheric bgm, story tracks, character themes - a soundtrack with good battle music but weak bgm will fall pretty low on the list.

in fact, i'll go one step further: how it's used within the game also weights it. games that maximise emotional impact by playing music at the right time will be high up, while soundtracks that waste good tracks on trivial situations get marked down.

also, compilation/collection soundtracks, ie hotline miami and project sekai aren't included - those are songs not originally made for the game, or based on songs not originally made for the game.

(and it should be obvious, but only games i've listened to the soundtrack of enough to be able to rank. DLCs are included as part of a base game, as said DLCs often use music from the base game too.)

let's go!