Adult Students and Parents of Young Students!
A great, free, music notation program that students can use to write their own compositions is Finale Notepad.
This example is of an advanced score, but can be used to do even the simplest notations. Here’s an example of notation below, for both computer and iPad:
And here’s a cool music notation app for those of you on iPad (can also be used on a desktop):
This one I don’t know anything about! But worth checking out: