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How many keys are sufficient to learn mostly all basic piano exercises?

Electronic versions came with variety of keys, and versions with less keys are cheaper and use less space at home. However it would be stupid to buy something you later need to replace to progress above the certain level. I am not aware which exercises a teacher is about to give in the future.

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The term 'clavier' (as used in the original question ) encompasses all keyboard related instruments, from harpsichords through foot pedals to modern pianos and organs.

I'm guessing you mean a piano/keyboard of the electronic type.If so, I suggest 61 notes - 5 octaves - will be enough to keep you going for two or three years or more. You will find that the majority of songs and keyboard music will be covered by this. A lot of 'better' instruments, like work-stations, have an octave transpose button, to take the whole 'board up and down by 2-3 octaves.

A full-size keyboard should have 88 notes, like a proper piano, but as a beginner, you'll not use the top or bottom octave much. A compromise would be a 76 note 'board, to keep you busy for maybe 5 or 6 years, or even for ever !

Check other answers on this site for other aspects like touch, etc. These may become more important to you as you learn to play.A good teacher will guide you to a suitable instrument far better than answers here.

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