As a confirmed, fully paid up and committed Geek, I have to say that the first thing that sprung to mind when Parami was speaking about her dream, in which she sang to release the souls of beings who’d passed on, was Final Fantasy X (probably the last great FF game released).
In FFX, Yuna performs a similar service to the souls of the dead (albeit by dancing rather than singing) so that they won’t remain remain in the world, craving existence so strongly that their jealousy of the living turns them into monsters.
Which is, the Dharma tells us, also a very real risk for those of us not yet dead.