Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
Q:3/8=60
M:6/8
K:G
['d>ed cBA']  
X:1
L:1/8
Q:3/8=60
M:6/8
K:G
 B/c/ | d>ed cBA | d>ed cBA | BdG d>cB/A/ | GG/G/G/G/ G2 | B/c/ | d>ed cBA | d>ed cBA | BdG AcF | 
 G3- G2{c} B/{A} G/ | ADD Dd/c/B/A/ | BGG Gg/=f/e/d/ | eAc B>cA | B3 d2 d | b gd (d>c)B/A/ | 
 GG/G/G/G/ AA/A/A/A/ | BGB (d>c)B/A/ | GG/G/G/G/ G2 |]  