The most interesting part of the article is that the guy wasn't a player for most of his life. Proof that if some is determined to learn a musical instrument, it doesn't matter how old you are-medical conditions aside if present.
The reading music part is most impressive. Most can learn to "read" music, but to be able transfer that to the keys is another thing.
I live with rheumatoid arthritis and a list of challenges but manage to play guitar.
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