Until about a month ago I had never heard of Rosetta Tharpe. After attending a Gillian Welch show where she and David Rawling did a version of "Didn't it Rain" I began to search for the track on online. I came across Tharpe's version of the song and after a little research was impressed to find out that she played guitar on the track. Then I found a large collection of videos of her playing on early television shows on Youtube. Gibson now has a fantastic article about Rosetta on their site.