There are several factors in the piano’s sound as to how many keys it has. The key-pianist of an amateur pianist has only four keys: the C, F, A, and B keys of the piano. That is, he is essentially playing only one octave for beginners, and only six octaves for advanced pianists. If you play with those keys, you will get a good sound.
The beginner who plays four keys gets his best sound when each of the keys has its own key-piano sound that can be used to make a “key” sound in music. This can be easily demonstrated by playing four notes with one note per key (i.e. C#, D#, E, F#); or four notes with two notes each (C#, E#, F#) The idea of a five-note-per-key scale should not be lost.
Another reason why it is possible to play a five-note-per-key scale without a piano keyboard is that many people can feel their way. By playing one note per key, you get a more realistic sound (a natural “voice” of sound). In the case of the C, F, A, and B keys of a piano, there will be three or four keys that are very hard to hit and can take serious practice. Playing the five-note-per-key scale with three or four keys is often called “keyless” piano improvisation. It has been said by some teachers of keyless piano improvisation that you can never play a good solo in the key of C# because C# is the lowest note on the piano. If it were the lowest note, the F would be the next lowest note, and so on. (By not hitting it, you would not get the desired sound.) But, if it were lower, the A would be higher, the B would be the next higher, etc.
It should be noted here that pianists sometimes use the notation “C# = 1, F = 2, A = 3, B = 4” to indicate the “first” key and “second” key of the piano. In the case of the C key, F, A, and B make up the F key. In the case of the F and A keys, they make up the A key. If, in the key, B is high, it is a D key. If the B is low, it is a C key
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