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:Emin
['AGE B2 G AGE', 'DEE GEE']  
X:1
L:1/8
M:6/8
K:Emin
 EGA ABG | AGA AGE | B2 G AGE | GAA A3 | EGA ABG | AGB AGE | B2 G AGE | DEE E3 :| DEE GEE | 
 A2 A- AGE | DEE GEE | B2 G AGE | DEE GEE | A2 A- AGE | B2 G AGE | DEE EEE :|  