I am assuming that this material is made for students already learning about music and not for new-commers. At times the information seemed crammed. Those parts could have been broken up for a more clear delivery.
Having the auditory compare and contrast element was a great tool.
I really enjoyed the variety in assesments. Very cool to utilize several of the senses (visual and sound) to assess the learner.
The layout and design of the material was simple and easy to follow. The only comment I have is that students can just skip over assesments ny click the next arrow.