This is the original version from 1964 from the album "Wednesday Morning, 3 AM." Just Simon's guitar and the vocals. The famous version was released in 1966. After "Wednesday Morning, 3 AM" flopped, they split up. Without either their knowledge, electric guitars and drums were added and that version of The Sound 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).