The original music conservatories were orphanages. Through innovative teaching methods the masters of these old institutions were able to transform poor and often illiterate castoffs into elite musicians, many of whom became famous in the history of classical music. The book tells the story of how this was done. It shows what the lessons were like, what a typical day was like for an orphan, and how children progressed from simple lessons to ones more advanced than any seen today in colleges and universities. Recent rediscoveries of thousands of the old lessons have allowed us to understand how children’s minds were systematically developed to be able to “think” in music. That is, the lessons slowly built up the mental ability to imagine the interplay of two or more voices or instruments. Today we think of Mozart as having a miraculous ability to imagine musical works in his head, but in truth many of the conservatory graduates of that era had attained a similar level of controlled musical imagination. They could improvise for hours at the keyboard, and they could quickly compose whole works for ensembles. The book is accompanied by 100 YouTube videos so that readers can hear what the lessons sounded like.