I'd mentioned utilizing music and teaching computer science together a couple posts back, so I loved the example of using choruses as named functions. I think young students can see that when they learn, and they combine things they've learned, they too are sort of calling functions. If kiddos have lists of chores at home, they have a sort of named function there. Instead of writing each step to emptying a dishwasher, you can just ask someone to empty the dishwasher, and they know what you're talking about. Similarly, we can NEST functions in this way, just like we do with loops.
The combination of students learning directly from the teacher about defining, 'calling', and singing choruses and then writing their own choruses from popular or well-known songs is a great addition to the 'facilitator' module. It gives the impression that we're all learning and working together in the classroom, which is a key element of becoming a good computer scientist.
A small gripe for any support that might read this: I noticed that the link to "1. Review "Functions:Songwriting" Lesson Plan: Course D" at https://studio.code.org/s/K5-OnlinePD/stage/7/puzzle/9 inadvertently links to https://levelbuilder.code.org/curriculum/coursee/6/Teacher
A little hunting and poking around finds the correct lesson, but the lesson linked currently deals with loops! Just a bit confusing - the lessons at the bottom appear to link to Course E lesson plans instead of Course D - unsure if this is intentional.