Songs that fit the lone wanderer theme?

Depend on what type of music you expect.
https://www.youtube.com/watch?v=7cjEgovupTw

Grab songs from the other games.

https://www.youtube.com/watch?v=THbY7EL8k5w

Not sure if it fits the "apocalyptic" part, but No.9's "After It" always makes me think of someone wandering around, seeing lonely yet beautiful landscapes.
https://youtu.be/fZnZZ6WHKJk

https://www.youtube.com/watch?v=sSIkHrjPWTc

Cowboy Bebop - Gotta Knock A Little Harder

maybe a future wasteland?

walking dead chucks song