This is the original version from the 1964 album "Wednesday Morning, 3 AM." Just Simon's guitar and the vocals. The famous version was released in 1966 but after "Wednesday Morning, 3 AM" flopped, they split up. Without the knowledge of either of them, electric guitars and drums were added by the studio and released again. That version of The Sounds of Silence became very popular, reaching #1 on the charts in America on New Years Day, 1966. Because of this, Simon and Garfunkel teamed up again and created three more studio albums, one of which one a Grammy award for album of the year and song of the year (Bridge Over Troubled Water).