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
['(G/A/B/c/) dB', '(B/c/d) gd']  
X:1
L:1/8
M:2/2
K:G
 A | (G/A/B/c/) dc BGGB | (G/A/B/c/) dB AFFA | (G/A/B/c/) dB ecdB | cAfc AFF :: A | 
 (B/c/d) gd BGGc | (B/c/d) fc AFFA | (B/c/d) gd ecdB | cAfc AFF :|  