Create a series of chord progressions to improve the harmonic structure of the given music piece.
|: CFFA G2 AB | cfec BG E2 | GABG cdcB | A2 GF EG C2 | 
 CFFA G2 AB | cfec BGAB | cdeg fecB |1 AcBG F4 :|2 AcBG F2 AB |: 
 c3 f fgag | fgfd egcd | _e3 d efgf | ecfg fecB | AFFE F2 GB | Acfd efgf | 
 e2 fd ecBG |1 AcBG F2 AB :|2 AcBG F4 ||  
X:1
L:1/8
M:4/4
K:F
|:"F" CFFA"C" G2 AB |"F" cfec"C" BG E2 |"Gm" GABG"C" cdcB |"F" A2"Bb" GF"C" EG C2 | 
"F" CFFA"C" G2 AB |"F" cfec"C" BGAB |"C" cdeg fecB |1"F" Ac"C"BG"F" F4 :|2"F" Ac"C"BG"F" F2 AB |: 
"F" c3 f fgag | fgfd"C" egcd |"Eb" _e3 d efgf |"C" ecfg fecB |"F" AFFE F2"C" GB |"F" Acfd"C" efgf | 
"C" e2 fd ecBG |1"F" Ac"C"BG"F" F2 AB :|2"F" Ac"C"BG"F" F4 ||  