Formulate chord combinations to increase the harmonic complexity of the specified musical excerpt.
A | dFcF BFAF | dcdf a3 f | bfaf bfaf | gfed cdeA | dAcA BAFA | dcdf a3 f | 
 gbgb fafa |1 egec d3 :|2 egec de(3efg |: a2 af g2 ge | f2 fd edcA | 
 a2 af g2 ge | efec defg | a2 af g2 ge | f2 fd edcA | aAgA fAeA | 
 bgec d4 :|  
X:1
L:1/8
M:2/2
K:D
 A |"D" dFcF BFAF | dcdf a3 f |"Bm" bfaf"F#m" bfaf |"Em" gfed"A" cdeA |"D" dAcA BAFA | dcdf a3 f | 
"G" gbgb"D" fafa |1"A" egec"D" d3 :|2"A" egec"D" de(3efg |:"D" a2 af"Em" g2 ge |"D" f2 fd"A" edcA | 
"D" a2 af"Em" g2 ge |"A" efec"D" defg |"D" a2 af"Em" g2 ge |"D" f2 fd"A" edcA |"D" aAgA fAeA | 
"A" bgec"D" d4 :|  