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My question is solely about learning piano techniques - learning scales (ranges), learning basic acords, different strength exercises, speed exercises, solely technique etudes. Can all this be learned, practised from some book alone without human supervision? Is there some book that explains it? This question is not about music theory (what scales are), but about practice - what exercises, in what order to take.
Of course, there is need for human master to learn art, but what about technique? I had music teacher in the past and she inveted different technical exercises. I was not keen to learn them, becauase - who likes them? But now I am seeing the worth of them, but the teache has gone. I would like to continue without her.
The question in its initial form was not clear. I already have some years of training with teacher, I know almost all of music theory, all the pitches/scales, chords and so on. I was exposed to some exercises, but currently I have no teacher and I would like to upgrade my skills. This question is not about basic skills (I am not thinking whether teacher is or is not necessary for them), but about technical skills to interpret sonatas by Bethoveen, works by Chopin, Listz and also by contemporary composers like Finnisy or Adesz. As I understand then even the olympic champions have couches, but I am not sure wheter Barenboim have some teacher and had one when he was younger and actively played piano.