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
['d2 AG FDFA BGBd cABc dfaf', 'dfaf dfaf gfga g2 ef gfed']  
X:1
L:1/8
M:4/4
K:D
 (3(ABc) | d2 AG FDFA | BGBd cABc | dfaf gfed | cdec A2 Bc | d2 AG FDFA | BGBd cABc | dfaf gfec | 
 A2 d2 d2 :: A2 | dfaf dfaf | gfga g2 ef | gfed cdeg | fefg f2 f2 | dfaf dfaf | gfga g2 ef | 
 gfed ceag | f2 d2 d2 :|  