Formulate chord combinations to increase the harmonic complexity of the specified musical excerpt.
D/ | D G A B/>A/ | G D D2 | D G A B/>c/ | B2 A z/ A/ | 
 D G A B/>c/ | d B G- G/A/ | B B A G/>E/ | D G- G E | D2 z2 |] 
 D G A B/>A/ | G D D2 | D G A B/>c/ | B2 A z/ A/ | 
 D/>D/ G/>G/ A B/>c/ | d B G3/2 A/ | B B/>B/ A G/>E/ | D G- G E | 
 D2"^(D7)" z3/2 |]  
X:1
L:1/4
M:4/4
K:G
 D/ |"G" D G"D7" A B/>A/ |"G" G D"D7" D2 |"G" D G"D" A B/>c/ |"G" B2"D7" A z/ A/ | 
"G" D G"D7" A B/>c/ |"G" d"G7" B"C" G- G/A/ |"G" B B"C" A G/>E/ |"G" D G-"C" G E |"G" D2"D7" z2 |] 
"G" D G"D7" A B/>A/ |"G" G D"D7" D2 |"G" D G"D" A B/>c/ |"G" B2"D7" A z/ A/ | 
"G" D/>D/ G/>G/"D7" A B/>c/ |"G" d"G7" B"C" G3/2 A/ |"G" B B/>B/"C" A G/>E/ |"G" D G-"C" G E | 
"G" D2"^(D7)" z3/2 |]  