In 1960, a mono version of Kind of Blue retailed for $3.98 (around $43 today). In 2014, a copy of the LP in a scratched sleeve signed by Miles Davis and drummer Jimmy Cobb sold at auction for $7,714.
By one calculation, the collective weight of every copy of Davis’ Kind of Blue ever sold—on vinyl, cassette and CD—would equal about 1,212 tons. That’s roughly the weight of 19,000 human beings, or 195 African elephants.
If you stacked all those physical copies, the pile would be about 7.5 miles high, nearly two miles taller than Mount Everest.
On Spotify, to pick one track, “Blue in Green” (5 minutes and 37 seconds) has been listened to 186,426,557 times as of this writing. That amounts to 1,983 collective listening years, while the…