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
['GGAA BBcc BGAF']  
X:1
L:1/8
M:2/4
K:G
 D | GGAA | BBcc | BGAF | GGzD | GGAA | BBcc | BGAF | GGzG | AAAA | BGGB | AAAA | BGGD | GGAA | 
 BBzc | BGAD | GG z |]  