To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
First? 50 songs. I would have thought these would at least be ordered by how easy they were so I could slowly progress. Sadly not, so I have to rifle through and mark the pages. Some versions of songs e.g You are my sunshine, much more difficult than the one I had learned. A page of fingering diagrams with numbered fingers would help.