Just What The Doctor Ordered

  B
E|----------------------------------| This is the main riff, used  
B|----------------------------------| through most of the song.    
G|----------------------------------| Have your index finger barre 
D|--9---7-----------------7---------| the 7th fret.                
A|----------7h9---7---7h9-----------|                              
E|-7---7---7-----7---7--------------|                              
           ^^^                                                     

            Very quick hammer
   E
E|--------------------------| Then it shifts up to the key 
B|--------------------------| of E...                      
G|--9---7-----------------7-|                              
D|----------7h9---7---7h9---|                              
A|-7---7---7-----7---7------|                              
E|--------------------------|                              
           ^^^                                             

            Very quick hammer

  F#
E|--------------------------------------| Now down to F sharp (Barre  
B|--------------------------------------| the 2nd fret)               
G|--------------------------------------| Play a quick E5 after doing 
D|--4---2-----------------2-------------| this riff once, then go     
A|----------2h4---2---2h4---------------| back to the key of B.       
E|-2---2---2-----2---2------------------|                             
           ^^^                                                        

           Very quick hammer


There are a few variations to the basic riff.  Right before the solo,
when the rhythym guitar plays alone, you hear this:

E|----------------------------| 
B|----------------------------| 
G|----------------------------| 
D|--9---7------------------7--| 
A|----------7h9---7---7779----| 
E|-7---7---7---7---7----------| 
           ^^^                  

            Very quick hammer


Lastly, during the outro solo, you hear this variation:
E|--------------------------------| 
B|--------------------------------| 
G|--------------------------------| 
D|--9---7-------------------------| 
A|----------7h9---7--12-11-10-----| 
E|-7---7---7---7-----10-9--8------| 
           ^^^                      

            Very quick hammer