Construct a range of chord structures to intensify the harmonic complexity of the provided musical piece.
e |: f2 A ABA | B2 A d2{e} d | c2 B BAB | g3 f2 e | f2 A ABA | 
 B2 A d2{e} d | c2{d} c cBc | d3 z3 :| ef |: g2 g gfe | f2 f fed | 
 Bee efe | d2 B BAB | g2 g gfe | f2 f fed | Bee efa | b3 a3 :|  
X:1
L:1/8
M:6/8
K:D
 e |:"D" f2 A ABA |"A7" B2 A"D" d2{e} d |"G" c2 B BAB |"A7" g3 f2 e |"D" f2 A ABA | 
"A7" B2 A"D" d2{e} d |"A7" c2{d} c cBc |"D" d3 z3 :| ef |:"G" g2 g gfe |"D" f2 f fed | 
"Em" Bee efe | d2 B BAB |"G" g2 g gfe |"D" f2 f fed |"Em" Bee efa |"G" b3"A7" a3 :|  