Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:3/4
K:G
['G2 F>G A2 (B>d)', 'cA BG']  
X:1
L:1/8
M:3/4
K:G
 G2 F>G A2 | (B>d) (c/B/) (A/G/) FD | G2 F>G A2 | (B>d) (d/c/) (A/F/) G2 :| B>d d>e cA | 
 BG (c/B/) (A/G/) FD | B>d d>e cA | BG (d/c/) (A/F/) G2 | B>d =f(e/d/) cA | 
 BG (c/B/) (A/G/) FD/D/ | G>G FG A>G | Bd (d/c/) (A/F/) G2 ||  