I wouldn't call this Spring cleaning, since this has been an on-going process for months now, but I've been opening drawers and old boxes for a while, and one of the cool things about this is that I can look at a note, partially decipher what I was planning to get around to looking up someday, and look it up.
Like this note from probably 1999: "Shilla(?) did Celtic version of Ain't No Sunshine". Probably jotted down while listening to the radio in the car.
We live in a wonderful age of Google, DuckDuckGo, and other search engines, and I eventually found this by Sileas:
Click to view
But it was an impressive search list (apparently this is an idea that traveled far in folk circles), and I also found this by the Reed and Soul Association:
Click to view
Thank you Sileas, Reed and Soul Association, and most of all thank you
Bill Withers.