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
['A3/2 c/ BG']  
X:1
L:1/8
M:4/4
K:G
 DG FG AB F2 | G2 A3/2 c/ BG G2 | DG FG AB F2 | G2 A3/2 c/ BG G2 | B d/d/ (d c/)B/ cc c2 | 
 B c/B/ AG FE D2 | D/D/ GF GA B F2 | G/ G3/2 A3/2 c/ BG G2 |:  