Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:2/4
K:G
['dg fe dB GA/B/ cA', "dg bd' c'a ag f/e/d ef"]  
X:1
L:1/8
M:2/4
K:G
 dg fe | dB GA/B/ | cA ed/c/ | Bd G2 | dg fe | dB GA/B/ | cA ed | G2 G2 :| dg bd' | c'a ag | 
 f/e/d ef | ag fe | dg bd' | c'a ag | f/e/d ef | g2 g2 :|  