Formulate chord combinations to increase the harmonic complexity of the specified musical excerpt.
|: [GE] | [GE] [cA] [ec] | [af] z/ [ge]/ [ge] | [GE] [cA] [ec] | [ge] z/ [fd]/ [fd] | 
[M:2/4] [af] z | [ge] z |[M:3/4] [eG]/[fA]/ [fA] [BF] | [cE]/[BD]/ [cE]/[dG]/ [ec] | 
[M:2/4] [af] z | [ge] z |[M:3/4] [ec]/[fB]/ [fA] [BF] | [cE] z :|  
X:1
L:1/4
M:3/4
K:C
|: [GE] |"C" [GE] [cA] [ec] | [af] z/ [ge]/ [ge] | [GE] [cA] [ec] |"G7" [ge] z/ [fd]/ [fd] | 
[M:2/4]"F" [af] z |"C" [ge] z |[M:3/4]"G7" [eG]/[fA]/ [fA] [BF] |"C" [cE]/[BD]/ [cE]/[dG]/ [ec] | 
[M:2/4]"F" [af] z |"C" [ge] z |[M:3/4]"G7" [ec]/[fB]/ [fA] [BF] |"C" [cE] z :|  