It's not about necessity as much as it is having the tools to tackle the possibilities that you may want to explore. Kelly said "I simply want to be good enough to read a music sheet and then play it." That doesn't necessarily entail a safari into all of the myriad routes to piano enjoyment. Really, I suspect all he'd need would be less than a year of lessons from a proficient teacher. After that foundation, an understanding of basic theory and discipline, he can choose to go after Schoenberg or Green Day.
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