Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:4/4
K:C
['(de) (de)', 'dgBd GBdg']  
X:1
L:1/8
M:4/4
K:C
 B2 (de) (de) (de) | dg b2 dg b2 | c'2 ab abab | agfg af d2 :: bg g2 dgBd | GBdg fa a2 | 
 (bg g2) dgBd | GBdg ag g2 :|  