Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:6/8
K:G
['D GBB Acc Bdd c2 e dcB']  
X:1
L:1/8
M:6/8
K:G
|: D | GBB Acc | Bdd c2 e | dcB Adc | BGG G2 :|  