Here the guiding frase (in other word the intro )of Layla of Eric Clapton. I think it?s quite good 
 
Hammer on: h 
Pull off:  p 
 
(disortion)                       
E|-----------------|--------------|---------------------| 
H|-----------------|--------------|---------------------| 
G|-----------------|--------------|---------------------| 
D|-------0h3p0---0-|--7----5---3--|-------3----5----7---| 
A|--0h3p0------3---|--5----3---1--|-------1----3----5---| 
E|-----------------|--------------|----------3----5-----|