My string teacher was heavy set and when I first met him when he was young had long hair but still heavy set and he just gotten married. He lost his hair by then, and a girl I use to date in high school ended later in his college class which totally overwhelmed me.
To make things short, he told me about these very old senior citizens that could play cello and violin concertos without knowing a note of music written. What they did he told me was listen to the recordings over and over until the music sounded exactly like it was written. He was in total amazement that that could be possible, but it was he saw it with his own eyes and ears.
I personally don’t think the music was exactly perfect note for note, but I like his total excitement. Anyways, they learnt to play the instrument in the style of their favorite composers. It is like Kreisler who composed music in the style of older composers.
It reminds me of the Beatles who said it was their playing their music in Hamburg Germany constantly to perfect their style and play real good that they hardly had time to sleep. Anyone, who works very hard at what they love come off saying in words or sounds what they really meant too.