Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
Q:3/8=110
M:6/8
K:D
['Bcd d2 A', 'A BGB']  
X:1
L:1/8
Q:3/8=110
M:6/8
K:D
 D | FGA FGA | Bcd d2 A | Bcd d2 A | BGE E2 D | FGA FGA | Bcd d2 A | Bcd d2 A | AFD D2 :: e | 
 f2 d ecA | faf ecA | Bcd d2 A | BGE E2 A | BGB AFA | GEG F2 A | BGB cAc | dAF D2 :|  