Formulate chord combinations to increase the harmonic complexity of the specified musical excerpt.
DE | FGF FED | FAA A2 d | Bdd Add | Bdd ADE | FGF FED | DAA A2 d | 
 BdB AFD | FEE E :: de | fgf fed | faa a2 g | fgf fed | gbb b2 a | 
 fga efg | def fed | BdB AFD | FEE E :|  
X:1
L:1/8
M:6/8
K:D
 DE |"D" FGF FED |"D" FAA A2 d |"G" Bdd"D" Add |"G" Bdd"A" ADE |"D" FGF FED |"D" DAA A2 d | 
"G" BdB"D" AFD |"D" FEE"A" E :: de |"D" fgf fed |"D" faa a2 g |"D" fgf fed |"G" gbb b2 a | 
"D" fga"A" efg |"D" def fed |"G" BdB"D" AFD |"D" FEE"A" E :|  