Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:4/4
K:G
['c2 ec B2 dB AGAB AGEF G2', 'd2 ef gage dBGB c2 ec B2']  
X:1
L:1/8
M:4/4
K:G
|: B | c2 ec B2 dB | AGAB AGEF | G2 EG DEGB | AGAB AGEG | c2 ec B2 dB | AGAB AGEF | G2 EG DEGB | 
 AGAB G3 :: F | GABc d2 ef | gage dBGB | c2 ec B2 dB | AGAB AGEF |1 G2 Bc d2 ef | gage dBGB | 
 c2 ec B2 dB | AGAB GDEF :|2 gfed efge | dBGB AGEF | G2 EG DEGB | AGAB G3 z ||  