How to unlock “Classic Mode — Final Results” music?

In Super Smash Bros. Ultimate, there is a song that plays on the “Final Results” screen when you beat Classic Mode. It is a solo piano arrangement of Lifelight that is over two minutes and forty five seconds long (I timed it).

It is a distinct version from “Classic Mode — Defeat”; the voicings are different, it is much longer, and it has a distinct end. It is completely different from the song called “Classic Mode — Final Results” in My Music.

Is there any way to unlock this song? I currently own every song from the shop (but I haven't beaten World of Light.)

Here is the song you are looking for. It's called Main Theme Piano Solo.

In order to unlock it, you have to get the True Ending.