Vulture:
In Conversation: Billy Joel. “The superstar on his songwriting silence, the country today, and his ideal farewell.” By David Marchese, 23 July 2018.

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“You’ve said you’ll do the Garden residency until demand slows down or you start playing at a level you’re not happy with. What clues would signal the latter?
If I can’t sing as well as I should. I’m already struggling. I wrote most of the songs that I’m doing when I was in my 20s and 30s and it ain’t easy to hit those notes in my 60s. We’ve dropped the keys of some songs already. Hopefully it’s not that noticeable. If I’m having a tough time hitting notes — I call it throwing junk pitches. Instead of having a fastball you throw off-speed. If I’ve got to throw too much junk, I’m going to consider stopping.”