Formulate chord combinations to increase the harmonic complexity of the specified musical excerpt.
|: D/E/F/G/ | A A/A/ A d | F3/2 F/ F A | A G/F/ G B | B A D/E/F/G/ | A A/A/ A d | 
 F3/2 F/ F A | A G/F/ G E | D2 :: A d | c3/2 A/ c e | d2 F A | A G/F/ G B | 
 B A A d | c3/2 A/ c e | d2 F A | A G/F/ G E | D2 :|  
X:1
L:1/4
M:2/2
K:D
|: D/E/F/G/ |"D" A A/A/ A d | F3/2 F/ F A |"A" A G/F/"G" G B |"D" B A D/E/F/G/ |"D" A A/A/ A d | 
 F3/2 F/ F A |"A" A G/F/"G" G E |"D" D2 :: A d |"A" c3/2 A/ c e |"D" d2 F A |"A" A G/F/"G" G B | 
"D" B A A d |"A" c3/2 A/ c e |"D" d2 F A |"A" A G/F/"G" G E |"D" D2 :|  