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:C
['d c']  
X:1
L:1/8
M:2/4
K:C
 d3/2 d/ e c | d3/2 e/ d c | A d c d | F G A2 | d3/2 d/ e c | d3/2 e/ d c | A d c d | F G A2 | 
 d c d2 | d3/2 e/ d c | d2 G3/2 A/ | c2 A G | F A G F/ E/ | D4 |]  