It's a lovely post John, and thanks to Mariana for sending me here. It made me think of a Kate Rusby's Christmas concert that I attended in 2013 and 2014. Kate started by collecting Christmas carols that were sung in South Yorkshire pubs after 19 th Century vicars ejected the players for being too jolly. She found that this happened elsewhere too and, for example, she has curated over 30 version of While Shepherds watch their flocks https://www.youtube.com/watch?v=mWz2X_h72nU She is deinitely in the relaionship with other artists (dead and alive) that you describe.