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:A
['aec dBG A3 c2 d edc dBA', 'a2 a aga bef gab age']  
X:1
L:1/8
M:6/8
K:A
 aec dBG | A3 c2 d | edc dBA | GEE dcB | A3 AGA | BAB gab | age dBe | ABA Ace :| a2 a aga | 
 bef gab | age d2 e | dBA GAB | a2 a aga | bef gab | age dBe | A3 Ace :|  