C major        F major       G major
        |\
     ---|-\------------------------------------------------------
        |  >                                                     
     ---|-/----------------------------------------O-------------
        |/                          O                            
     ---/------------------------------------------O-------------
       /|  _                        O                            
     -<-|-<->--------O-----------------------------O-------------
       \|  /                        O                            
     ---|\/----------O-------------------------------------------
        |                                                        
        V          --O-


Figure 2.1