Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:2/2
K:G
['d3 g edcB d2 gg edcB', 'GABc d2 de dBGB cdef eAAB c2']  
X:1
L:1/8
M:2/2
K:G
 d3 g edcB | d2 gg edcB | DGBG DGBG | DGBd cBAG | d3 g edcB | d2 gg edcB | gfgd ecAF | FGGF GABc :: 
 d2 de dBGB | cdef eAAB | c2 AB cBAG | Bdef G2 G2 | dBdg eceg | fg (3agf g2 (3def | gfgd ecAF | 
 GAAB AGBc :|  