Simpsons main riff 
The whole simpsons theme has 1:31 min, so this is just the well known main riff: 

e  
----------------------------------------------------|---------------------------------  
B ----------------------------------------------------|--------------------------------- 
G -----------------------2---0------------------------|--------------------------------- 
D ----------2-----4------------------2----------------|--------------------------------- 
A ----3------------------------------------3----0-----|-------------------------------1- 
E ----------------------------------------------------|-2--2--2--3---2--2--2--3--------- 

The last part repeat twice, then start all over again!