Nirvana 
          Where Did You Sleep Last Night?Riff: 
          1:----0-----------------------------------------------| 
          2:-0--0-----------------------------------------------| 
          3:-x--x-----------2--2-2-0--0-0--4--4-4-4-------------| 
          4:-2--2-----------2--2-2-0--0-0--4--4-4-4-0-------0-2-| 
          5:-2--2-----------0--0-0-x--x-x--2--2-2-2-0-------x-2-| 
          6:-0--0--0-0^2^3---------3--3-3-------------2-2-2^3-0-| 
 
          The rest of the song is simply variations on that chord 
progression 
           (Em A G5 B F#5 Em)