Daily musical engagement correlates with a marked reduction in dementia incidence. https://limelight-arts.com.au/news/listening-to-music-after-70-linked-to-sharp-drop-in-dementia-risk-australian-study-finds/  

Re-recording dates on BN - what is more, the JEPSEN's Jazz Records discography (published from 1962 onwards) listed the recording dates almost throughout for these releases. I just did a quick check on some of the BN acts (Blakey, Sonny Clark, Donaldson, Silver) and the'yre there. So visibly this info had been "salvaged" by researchers (Jepsen or whoever contibuted this info to him) and saved for posterity at a time before it may have got "lost" (for a time).  And some renowned labels such as Contemporary did list the recording dates even on the original releases, starting back in the 50s.  

SML, How You Been (International Anthem)

This is even more intriguing, because Monk cleaned up by now.  Sonny was still a bit of a mess.Think Sonny stole Monk's comp for money to fix, or that he thought he believed it was his own writing?