I always research a piece of music and/or the composer as I arrange it and a summary of what I’ve found is included in the books I assemble. For John Dowland, there is a definitive book by Diane Poulton (you’ll notice her index number at the bottom of the piece I arranged) written in 1972 which is available for free at archive.org. I haven’t read the whole book and use it for reference. She was a an English lutenist and musicologist.
I also try to find original folios of the music, many of which are downloadable. Here are two samples of “My Lord Willoughby’s Welcome Home” from notebooks of 1610.
