Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/16
M:2/4
K:G
['Bcde d2BB dBgB aBgB Acde d2BB', 'BcBA G2BA GBAB GBAB']  
X:1
L:1/16
M:2/4
K:G
 Bcde d2BB | dBgB aBgB | Acde d2BB | ebag fedB :| BcBA G2BA | GBAB GBAB | dcBA G2BA | GABc dedc | 
 BcBA G2BA | GBAB GBAB | dBcA BGAF | EFGA cedc ||  