Jam Section
G ||---------------------||
D ||---------------------|| Repeat over and over
A ||---4--4---2-4--4--2--||
E ||---------------------||

Here are some variations:
G ||---------------|-----------|-----------|-------------||
D ||---------------|-----------|-----------|-------4--4--|| Pompeii Style
A ||-(4)-2h4-(4)-4-|-2h4-(4)-4-|-2h4-(4)-4-|-2h4---------||
E ||---------------|-----------|-----------|-------------||
G ||-------------------------||
D ||-------------------------|| Done During Guitar Solo
A ||--4--4---2-2h4--4--4--2--||
E ||-------------------------||