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
['d2 dd', 'z GBBB GBBB dcAc (cB) A2 GBBB']  
X:1
L:1/8
M:2/4
K:G
 Bc | d2 dd | d2 dd | dgfe | e2 z d | (dc).c.c | (cB).B.B | (dc)(BA) | G3 z :: GBBB | GBBB | dcAc | 
 (cB) A2 | GBBB | GB dg | dBcA | G3 :|  