Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
Q:3/8=110
M:6/8
K:G
['ABA ABd (e/f/g)G GDE GAG']  
X:1
L:1/8
Q:3/8=110
M:6/8
K:G
 e | dBG GDE | ABA ABd |"^2" (e/f/g)G GDE | GAG B2 G | cAc BGB | ABA ABd |"^2" (e/f/g)G GDE | 
 GAG G2 ::  