I suppose this was submitted because of https://news.ycombinator.com/item?id=29052747 https://news.ycombinator.com/item?id=29052747 (Fundamentals of Piano Prac

I suppose this was submitted because of https://news.ycombinator.com/item?id=29052747 https://news.ycombinator.com/item?id=29052747 (Fundamentals of Piano Practice) and specifically this comment: https://news.ycombinator.com/item?id=29053520 https://news.ycombinator.com/item?id=29053520