Formulate chord combinations to increase the harmonic complexity of the specified musical excerpt.
ABAF ED CD | E2 A2 BAcB | AF AF EDCD | EFAB A2 cB | ABAF E2 C2 | E2 A2 BABc | 
 ecee fecf |1 ecBc A2 FG :|2 edcB A2 af |]: ecea fecd | efec fgaf | 
 ecea fecd | efec BAFA | cdef edcd | efec egfg | abae fgaf |1 
 ecBc A2 cd :|2 ecBc A2 c!D.C.!B |]  
X:1
L:1/8
M:2/2
K:A
"A" ABAF ED CD | E2 A2 BAcB | AF AF EDCD |"A" EFAB A2 cB | ABAF E2 C2 | E2 A2 BABc | 
"A" ecee"D" fecf |1"E" ecBc"A" A2 FG :|2"E" edcB"A" A2 af |]:"A" ecea fecd |"D" efec fgaf | 
"A" ecea fecd |"E" efec BAFA |"A" cdef edcd |"D" efec egfg |"A" abae"D" fgaf |1 
"E" ecBc"A" A2 cd :|2"E" ecBc"A" A2 c!D.C.!B |]  