Here is a mix of helpful materials for your music students! This set has a chord-focus. 
 
- Guide of 7th chords in Major scales
- Common German Musical Terms
- Interval Steps and Building Triads
- 7th Chords (Major, Dominant, and minor)
- 8th and 16th note Combinations 
- Worksheet for practicing parallel keys
- Music terms worksheet
- Presentation quiz on Primary Chords in 5 keys