The whole song is this simple riff

There are variations to this but this is the general riff
E:-----------------------------
B:-----------------------------
G:-----10--9-------9---7-------
D:-------------------------10--
A:-8---------------------------
E:-------------8---------------
   1   3   2   2   4   1   4

Dave_Matthews_Band_-_Under_the_Table_and

Tuning

Standard E-A-D-G-B-E

Studio Track

Video Reference

n36