... and for every Jimi Hendrix there's a thousand would-be guitarists who sold their guitars out of frustration, and for every Sonny Terry another thousand who threw their harmonicas in the bin. So just learn to play by trial and error and you'll magic-up some new inspired way of playing. If learning to drive just go out on the highway and "play it by ear" and you'll end up a top F1 driver - or dead.