I really like to play the piano and keyboard. Do you play? 
Oh no, I do not have the ear for it. My grandma could hear something and then play on her keyboard.
I wish I was as good as your grandmother. It's hard  to know when exactly to press down on the key to strike the strings. 
Yeah there is an art to it. Some people are just blessed with an ear for music.
String instrument
String instruments, stringed instruments, or chordophones are musical instruments that produce sound from vibrating strings when the performer plays or sounds the strings in some manner. 
Musicians play some string instruments by plucking the strings with their fingers or a plectrum—and others by hitting the strings with a light wooden hammer or by rubbing the strings with a bow. In some keyboard instruments, such as the harpsichord, the musician presses a key that plucks the string.
With bowed instruments, the player pulls a rosined horsehair
, it's just not my body," Radwańska said. "I have to do something else. I was just born to play like this. I have so many ideas. In your mind it's like, 'OK, I go down the line, then crosscourt, maybe drop shot.' But you have just one second, or even not one second, it just has to be automatic." Radwańska merely exhales when she strikes the ball, rather than loudly grunting like many of her peers. She