Sweet! My guess was 6. I proceeded by estimating the number of pianos per person (my guess was 7000 in NYC), then by estimating the frequency of tuning. I came

Sweet! My guess was 6. I proceeded by estimating the number of pianos per person (my guess was 7000 in NYC), then by estimating the frequency of tuning. I came up with ~20 pianos/day needing tuning and guessing the average tuner could handle 3 pianos / day (when I was a kid I recall the tuner taking a couple of hours.) some edge cases like Carnegie Hall (where the piano is probably tuned quite frequently) probably skew the numbers somewhat. Also, I would guess that a city with mostly single family homes, say, Houston, has more pianos/capita than NY or Chicago, based on the pain in the assedness of moving a piano into an apartment, though that may be offset by the number of music schools and cultural institutions.