Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:6/8
K:G
['B cAF', 'B cAF']  
X:1
L:1/8
M:6/8
K:G
|: D | .G2 G AFD | .B2 B cAF | d2 B c2 A | GBG AFD | .G2 G AFD | .B2 B cAF | d2 B cAF | GBA G2 :: 
 B/c/ | .d2 d dBG | .c2 c cAF | d2 B cAF | GBG AFD | .G2 G AFD | .B2 B cAF | d2 B cAF | GBA G2 :|  