Construct a range of chord structures to intensify the harmonic complexity of the provided musical piece.
|: A | d3 fef | d3 AB=c | BAB gfe | fed cBA | d3 fef | d3 AGF | GAB EAG | 
 FDD D2 || A | FAD FAD | GBE GBE | Ace gfe | DAG FGE | FAD FAD | 
 GBE GBE | Ace gfe | d3 D2 A | FAD FAD | GBE GBE | Ace gfe | dAG FGE | 
 D2 d E2 e | F2 f G2 g | [aA]fd [eE]cA | [dAFD]3 [dAFD] :|  
X:1
L:1/8
M:6/8
K:D
|: A |"D" d3 fef | d3 AB=c |"Em" BAB gfe |"D" fed"A7" cBA |"D" d3 fef | d3 AGF |"Em" GAB"A7" EAG | 
"D" FDD D2 || A |"D" FAD FAD |"Em7" GBE GBE |"A7" Ace gfe |"D" DAG FGE |"D" FAD FAD | 
"Em7" GBE GBE |"A7" Ace gfe |"D" d3 D2 A |"D" FAD FAD |"Em7" GBE GBE |"A7" Ace gfe |"D" dAG FGE | 
"D" D2 d"A/C#" E2 e |"D" F2 f"Em" G2 g |"D/A" [aA]fd"A" [eE]cA |"D" [dAFD]3 [dAFD] :|  