Kate McKinnon's cover of Hallelujah inspired me to find the lyrics. Quite amazing how he retold that biblical tale. (McKinnon's cover was amazing, too.)
And you're right, Richard. Most recently Leon Russell. One reason I go to as many concerts as I can; I didn't get tickets to a Johnny Cash concert, figuring there'd be another chance. The next year he got sick and didn't tour again. I don't want to miss out on others if I get a chance. Seeing people live gives me a greater appreciation of their talent than just hearing the records or seeing them on TV.