Compose harmonious chord progressions to enhance the existing musical composition.
|: DD | [dB]2 [dB] [ec][dB] | [cA]3 [dB][dB] | [fd]2 [fd] [ec][cA] | [BG]3 DD | 
 [dB]2 [dB] [dB][fd] | [ec]3 [af]/[ge]/[fd]/[ec]/ | [dB]2 [dB] [dB][cA] | [BG]3 :: 
 [GB,][AC] | [BD]2 [BD] [cE][BD] | [cE] [BD]2 [GB,][AC] | [BD]2 [cE] [d=F][dF] | 
 [cE]3 [cE][cE] | [cE]2 [cE] [cE][cE] | [fA]2 [fA] [fA][eG] | [dF]2 [cE] [BD][AC] |1 
 [BD]3 :|2 [GB,]3 |]: [DB,][DB,] | [GD]2 [GD] [GD][AF] | [BG]2 [BG] [BG][cA] | 
 [dB]2 [dB] [cA][BG] | [cA]3 [AE][AE] | [GE]2 [FD] [AF][AF] | [GE]2 [FD] [AF][GE] | 
 [FD]2 [EC] [DB,][CA,] |1 [DB,]3 :|2 [B,G,]3 |]  
X:1
L:1/8
M:5/8
K:G
|: DD |"G" [dB]2 [dB] [ec][dB] |"Am" [cA]3 [dB][dB] |"D7" [fd]2 [fd] [ec][cA] |"G" [BG]3 DD | 
 [dB]2 [dB] [dB][fd] |"Am" [ec]3 [af]/[ge]/[fd]/[ec]/ |"D7" [dB]2 [dB] [dB][cA] |"G" [BG]3 :: 
 [GB,][AC] |"G" [BD]2 [BD] [cE][BD] | [cE] [BD]2 [GB,][AC] | [BD]2 [cE] [d=F][dF] | 
"Am" [cE]3 [cE][cE] | [cE]2 [cE] [cE][cE] |"D7" [fA]2 [fA] [fA][eG] | [dF]2 [cE] [BD][AC] |1 
"G" [BD]3 :|2"G" [GB,]3 |]: [DB,][DB,] |"G" [GD]2 [GD] [GD][AF] | [BG]2 [BG] [BG][cA] | 
 [dB]2 [dB] [cA][BG] |"Am" [cA]3 [AE][AE] |"D7" [GE]2 [FD] [AF][AF] | [GE]2 [FD] [AF][GE] | 
 [FD]2 [EC] [DB,][CA,] |1"G" [DB,]3 :|2"G" [B,G,]3 |]  