The key changes from example to example. This makes it hard to track the degrees in the progressions presented, as when following a new example I still mentally hear the “home” tone from the previous one.
This undermines the effectiveness of the material presented.
Please, either:
- Make sure all the excerpts are in the same key
- Play a short I chord (or the scale itself) before playing the excerpt, so that the ear gets accustomed to the key used.
- Place a button near each example that allows me to play the scale used.