Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/16
Q:1/4=100
M:2/4
K:D
['defg a2b2', 'e8 edcB A2f2 edcB A2a2 g2eg f2df']  
X:1
L:1/16
Q:1/4=100
M:2/4
K:D
 defg a2b2 | a4 d'4 | a2gf g2fe | f2d2 D4 | defg a2b2 | a2d2c2B2 | c2d2 (d3c/d/) | e8 :| 
 edcB A2f2 | edcB A2a2 | g2eg f2df | edcB A4 | defg a2b2 | a2c2d2G2 | F2d2E2c2 | d8 :|  