Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:2/4
K:Dmin
['d>e dc Af ef', 'ga/g/ fd cf']  
X:1
L:1/8
M:2/4
K:Dmin
|: d>e dc | Af ef | AF/A/ cA | G2- Gc | d>e dc | Af ef | Ac A/G/F | D2 D2 :: ga/g/ fd | cf af | 
 ba/g/ fd/f/ | g2- gg | ga/g/ fd | cf ef | Ac A/G/F | D2 D2 :|  