I have student of mine playing prelude songs before we have Opening Exercises. The idea is that she gets to practice, the children are able to sing some action songs after having sat through Sacrament Meeting, and it allows the Primary Presidency to get ready.
I simplified Little Seeds Lie Fast Asleep for her. It’s probably TOO easy for her, but it’s a good one to spring on her when she’s sight reading.
Here’s the pdf: Little Seeds Lie Fast Asleep simplified music