Construct harmonious chord structures to elevate the given musical piece.
GBd eBd efg dBd | GBd eBd e2 f g3 | GBd eBd efg dBd | 
 bag agf e2 f g3 :| bag agf efg dBd | bag agf e2 a a3 | 
 bag agf efg dBd | G3 dBd e2 f g3 :|  
X:1
L:1/8
M:12/8
K:G
"G" GBd eBd"C" efg"G" dBd | GBd eBd"C" e2 f"G" g3 | GBd eBd"C" efg"G" dBd | 
 bag"D7" agf"C" e2 f"G" g3 :|"G" bag"D7" agf"C" efg"G" dBd | bag"D7" agf"C" e2 a"D7" a3 | 
"G" bag"D7" agf"C" efg"G" dBd | G3 dBd"C" e2 f"G" g3 :|  