Formulate chord combinations to increase the harmonic complexity of the specified musical excerpt.
|: A2 AB AFED | B2 BA BcdB | A2 AB AFED | gfed Bcde :| | f2 fd g2 ge | 
 f2 fd Bcde | f2 fd g2 fg | afed Bcde | f2 fd g2 ge | f2 fd Bcde | 
 defg afbf | gfed BcdB ||  
X:1
L:1/8
M:4/4
K:D
|:"D" A2 AB AFED |"G" B2 BA BcdB |"D" A2 AB AFED |"G" gfed Bcde :| |"D" f2 fd"G" g2 ge | 
"D" f2 fd"G" Bcde |"D" f2 fd"G" g2 fg |"D" afed"G" Bcde |"D" f2 fd"G" g2 ge |"D" f2 fd"G" Bcde | 
"D" defg afbf |"G" gfed BcdB ||  