Teaching Middle- and Highschool about chords and chord sequences is essential, however, at times it can be a bit "dry" or boring.
By creating tasks that involve real life applications, students are generally more interested and will enjoy the assignments significantly more!
I have published a step-by-step unit plan on Midnight Music .
Have a look and see if you can use any of these ideas for your music classroom. It includes ideas about how to effectively use YouTube, chordchord.com, audio spitfire, Garageband as well as GarageBand for iPad to get your students excited about using chords and chord sequences. You can access the full article HERE.