Formulate chord combinations to increase the harmonic complexity of the specified musical excerpt.
ABcd e2d2 | e2d2 dcBA | ABcd e2d2 | e2e2 e4 :: B2A2 A2G2 | e2d2 dcBA | B2A2 AG^FG | 
 A2A2 A4 :|  
X:1
L:1/16
Q:1/4=109
M:2/4
K:Amin
"Am" ABcd e2d2 | e2d2 dcBA | ABcd e2d2 | e2e2 e4 ::"G" B2A2 A2G2 | e2d2 dcBA | B2A2 AG^FG | 
"Am" A2A2 A4 :|  