I found a use for the STAX EPiano and Organ kit. Use it here.
Includes: midi parts, .sng, chords and lyrics in plain text and pdf. Source files was a commercially purchased product, as such, it is not being provided here.
Intro part is very long, nearly the whole song, but then the jam after the last chorus (Go, Take a sister then by the hand…) becomes the main loop, and will repeat as long as you like, with the Em C progression. If you want to turn in into a 20 minute long jam, it’s your call.