At the Bulletproof Musician, Dr. Noa Kageyama has a great post on How many hours a day you should practice. I like this bit: “Deliberate practice is a systematic and highly structured activity, which is, for lack of a better word, scientific. Instead of mindless trial and error, it is an active and thoughtful process of experimentation with clear goals and hypotheses.” Sometimes our singers (and we ourselves at times) look at rehearsal as a mindless activity. It is crucial as conductors that we cultivate active learning and listening in rehearsal at all times. That will make our singers achieve their best as musicians.