Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:6/8
K:G
['B3 AGF', 'c3 BGG ABd']  
X:1
L:1/8
M:6/8
K:G
 B3 Bdc | B3 AGF | DGG AGF | AGG Adc | B3 BdB | B3 AGF | FGA/B/ cAA | FDE FGA ::"^tr" B3"^tr" c3 | 
 BGG ABd | g3 gdB | dgg fdc |"^tr" B3"^tr" c3 | BGG ABd | fef gdB | EDE FGA :|  