If you want the last human song to change, you can just change it your self.
Replace the sound file with whatever you want.
Don't forget that your song shouldn't be longer then 2 minutes because then the same song starts playing again after 2 minutes
which means you will hear 2 songs playing at the same time. You also need to convert it a little otherwise it doesn't works though
I'm not sure if this is necessary on lasthuman song since it isn't the only thing I have modified.
But I do think that we need a new last human song since the one that we have at the moment is weak and is like 1 minute long.