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
['', 'dB B2', 'afdf e3']  
X:1
L:1/8
M:4/4
K:G
 ge |: dB B2 dBGB | dBBd g3 e | dBBe dBGd | (3gag fd egfe | dB B2 dBGB | dB B2 dega |1 b2 af gfed | 
 egfd e3 g :|2 bgaf gfed | egfd e3 f || g2 bg fgaf | (3gag fd edBd | g3 b fgaf | feed eBfB | 
 g2 bg fgaf | g2 fd edBd | fgaf defg |1 afdf e3 f :|2 afdf e3 g ||  