Ledger lines

I've created this video for my 1 ESO students in order to explain to them how to use ledger lines and how to read notes on them. Once I created the video (using QuickTime Player), I uploaded it to my YouTube channel and, finally, I've taken the link in order to insert some questions -using EDpuzzle- to have them focus on the content.

This is the final result, I hope you like it: