Formulate chord combinations to increase the harmonic complexity of the specified musical excerpt.
f | ecA AcA | F2 A E2 A | EFG ABc | d2 c B2 f | ecA AcA | 
 F2 A E2 c | d2 f ecA | B3 A2 :| f | ecA Ace | fdf fga | ecA AGA | 
 BGE E2 c/d/ | ecA Ace | fdf fga | ecA BGE | A3- A2 || f | ecA Ace | 
 fdf fga | ecA AGA | BGE E2 c/d/ | ece fdf | geg agf | edc BAG | 
 A3- A2 |]  
X:1
L:1/8
M:6/8
K:A
 f |"A" ecA AcA |"D" F2 A"A" E2 A |"A" EFG"F#m" ABc |"Bm" d2 c"E7" B2 f |"A" ecA AcA | 
"D" F2 A"A" E2 c |"D" d2 f"A" ecA |"E7" B3"A" A2 :| f |"A" ecA Ace |"D" fdf fga |"A" ecA AGA | 
"E7" BGE E2 c/d/ |"A" ecA Ace |"D" fdf fga |"A" ecA"E7" BGE |"A" A3- A2 || f |"A" ecA Ace | 
"D" fdf fga |"A" ecA AGA |"E7" BGE E2 c/d/ |"A" ece"D" fdf |"E7" geg"F#m" agf |"Bm" edc"E7" BAG | 
"A" A3- A2 |]  