Decline of key changes in popular music
Briefly

Chris Dalla Riva analyzed key changes in songs that made the Billboard Hot 100, between 1958 and 2022.Key changes are near non-existent after 2010.The most interesting part is why:

Thus, if you changed the key of "Juicy," Biggie wouldn't necessarily have to change how he raps, but if you changed the key of "Over the Rainbow," Judy Garland would have to sing different pitches.
Read at FlowingData
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