Create chord progressions that enrich the harmonic structure of the provided musical piece.
ag cg ec | Bg fd b2 | ag Bg fB | cg ec c'2 | ag cg ec | Bg fd b2 | ag Ba fB | 
 c4 z2 :: G2 Bd gB | cc' ag ec | Bb ag fB | cc' ag e2 | G2 Bd gB | 
 cc' ag ec | Bb ag fB | c4 z2 :|  
X:1
L:1/8
M:3/4
K:C
"C" ag cg ec |"G7" Bg fd b2 | ag Bg fB |"C" cg ec c'2 | ag cg ec |"G7" Bg fd b2 | ag Ba fB | 
"C" c4 z2 ::"G7" G2 Bd gB |"C" cc' ag ec |"G7" Bb ag fB |"C" cc' ag e2 |"G7" G2 Bd gB | 
"C" cc' ag ec |"G7" Bb ag fB |"C" c4 z2 :|  