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:D
['c A3', 'c A3 fgaf gbag fdec']  
X:1
L:1/8
M:4/4
K:D
 ed | c A3 (3.B.c.d ed | cAAG FDDd | c A3 (3.B.c.d eg | fdec d2 ed | c A3 cded | cABG FADd | 
 c A3 BBeg | fdec d3 A || dfaf ggeg | fded c A3 | fgaf gbag | fdec d2 (3.e.f.g | a3 f ggec | 
 d2 ed c A3 | fgaf gbag | fdec d4 ||  