Simon & Garfunkel - Rose of Aberdeen (Demo) 

2007 saw the six disc expanded version of "The Collection: Simon & Garfunkel" - a complete reissue of all studio LP's including some rare bonus material that hasn't been released on streaming.
This bonus track was featured in the 2001 CD reissue of Sounds of Silence. - Simon and Garfunkel's second album. This track in particular was recorded July 8, 1970.