Correction for the weight of a Grand Piano
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How heavy is 370 grains?
It's about one-twenty-thousandth as heavy as a Grand Piano
The weight of a Grand Piano is about 6,900,000 grains.
(for Steinway & Sons, Model D Concert Grand Piano)
A Grand Piano, of the kind used for concert performances in large music halls, weighs 6,900,000 grains. Well-made pianos such as this may last 75 to 100 years.