Lyrics here - Nehemiah Skip James)
As is typical of his era, James recorded a variety of material — blues and spirituals, cover versions and original compositions — frequently blurring the lines between genres and sources. For example, "I'm So Glad" was derived from a 1927 song by Art Sizemore and George A. Little entitled "So Tired", which had been recorded in 1928 by both Gene Austin and Lonnie Johnson (the latter under the title "I'm So Tired of Livin' All Alone"). "one of the most extraordinary examples of fingerpicking found in guitar music."
Here is the original
This worthy version was recorded for the TV documentary
This is the version I remember