In medicine there is a term ‘prescription compliance’. I think in music education it is pretty much the same – we as teachers give the students great exercises but these won’t work unless they actually master those before moving on.
That is why we keep writing new method books but what we should really do is to make sure that the students take their ‘prescription’ seriously.
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A fun fact: ‘pill’ in Estonian (that’s what we speak here) means ‘musical instrument’ 🙂