Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:6/8
K:F
['d2 e', 'd2 f']  
X:1
L:1/8
M:6/8
K:F
 F3 fgf | e2 c d2 e | f2 a gec | d2 e fgf | A2 f dcB | A2 G F3 :: a2 f d2 f | agf g2 e | fce gfe | 
 f2 e d2 f | fga g2 e | cde f3 :|  