Formulate chord combinations to increase the harmonic complexity of the specified musical excerpt.
A2 G |: FAA ABc | d d2 def | AGF G2 A | BGE E{F}DE | 
 E{F}DF ABc | dec def | AGF EAG |1 F{G}DD D2 E :|2 FDD Dgf |: 
 ecA Agf | edc d2 F | G2 G FGA | BGE Ecd | ecA gfe | 
 dec def | AGF EAG |1 FDD Dgf :|2 FDD D2 f |: gg{a}g ff{g}f | 
 gfe d2 f | gg{a}g fga | bge e2 f | gg{a}g ff{g}f | gfe d2 A | 
 Bcd edB |1 AFD D2 f :|2 AFD D2 E |: FAA ABc | d d2 def | 
 AGF G2 A | BGE E{F}DE | E{F}DF ABc | dec def | AGF EAG |1 
 F{G}DD D2 E :|2 FDD Dgf |: ecA Agf | edc d2 F | G2 G FGA | 
 BGE Ecd | ecA gfe | dec def | AGF EAG |1 FDD Dgf :|2 
 FDD D2 f |: gg{a}g ff{g}f | gfe d2 f | gg{a}g fga | bge e2 f | 
 gg{a}g ff{g}f | gfe d2 A | Bcd edB |1 AFD D2 f :|2 AFD D3 ||  
X:1
L:1/8
M:6/8
K:D
 A2 G |:"D" FAA"F#m" ABc |"D" d d2"D" def |"D" AGF"G" G2 A |"Em" BGE"Em" E{F}DE | 
"D" E{F}DF"F#m" ABc |"D" dec"D" def |"D" AGF"Em" EAG |1"D" F{G}DD"D" D2 E :|2"D" FDD"D" Dgf |: 
"A" ecA"D" Agf |"A" edc"D" d2 F |"G" G2 G"D" FGA |"Em" BGE"A" Ecd |"A" ecA"Em" gfe | 
"D" dec"D" def |"D" AGF"Em" EAG |1"D" FDD"D" Dgf :|2"D" FDD"D" D2 f |:"G" gg{a}g"D" ff{g}f | 
"Em" gfe"D" d2 f |"G" gg{a}g"D" fga |"Em" bge"Em" e2 f |"G" gg{a}g"D" ff{g}f |"Em" gfe"D" d2 A | 
"G" Bcd"Em" edB |1"D" AFD"D" D2 f :|2"D" AFD"D" D2 E |:"D" FAA"F#m" ABc |"D" d d2"D" def | 
"D" AGF"G" G2 A |"Em" BGE"Em" E{F}DE |"D" E{F}DF"F#m" ABc |"D" dec"D" def |"D" AGF"Em" EAG |1 
"D" F{G}DD"D" D2 E :|2"D" FDD"D" Dgf |:"A" ecA"D" Agf |"A" edc"D" d2 F |"G" G2 G"D" FGA | 
"Em" BGE"A" Ecd |"A" ecA"Em" gfe |"D" dec"D" def |"D" AGF"Em" EAG |1"D" FDD"D" Dgf :|2 
"D" FDD"D" D2 f |:"G" gg{a}g"D" ff{g}f |"Em" gfe"D" d2 f |"G" gg{a}g"D" fga |"Em" bge"Em" e2 f | 
"G" gg{a}g"D" ff{g}f |"Em" gfe"D" d2 A |"G" Bcd"Em" edB |1"D" AFD"D" D2 f :|2"D" AFD"D" D3 ||  