There are 27 bones in the human hand. If we picture only three states per joint, extended, neutral, and contracted, and assume that how you arrive at a position matters, a hand can assume roughly 7.6 trillion positions. To get a sense of that, if you formed one position per second (and didn’t stop to eat or sleep) you could do each one of them once in about 14.5 million years. Of course for guitar playing there are many more than three joint positions.
The right hand is good! Now move on to the left. For two hands simultaneously, the number of possible combinations is 5.8 followed by 25 zeros.
Our fingertips can at their best differentiate things at 20 nanometers. Were you a giant out in space with a fingertip the size of the entire Earth, your touch could distinguish a car from a house. Our grip strength is greater than a gorilla’s or a chimp’s, who are otherwise far stronger than we. Our hand-strength range, from holding a human hair to world-class deadlift, is nine orders of magnitude. (The difference between your height and Mt Everest is a less than four orders of magnitude.) Our time control, according to one study, allows the note attack and release difference between first violins and concert artists to be measured in less than half of a tenth of a second.
In the undiluted meaning of the word, our hands are awesome.
Learning music on guitar 