Is it possible to master a musical instrument on your own without any instructions?
This means without anything at all, except as a tool. Let's say there is Vasya, who sometimes listens to music, but has never played an instrument in any way. And then they give him, say, a piano! But that's all. Access to the Internet is blocked, other people's songs are not allowed to learn, and all he has is a piano and previously dried music in his head, which sometimes pops up. Will Vasya be able to understand how to play the instrument (meaning really at a good level) purely theoretically? I just have a friend who says that in a couple of weeks he was able to figure out the piano, chords and all that on his own! Is this possible?