Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/16
M:2/4
K:none
['', 'd2F2 A2D2 G2GF E4']  
X:1
L:1/16
M:2/4
K:none
[K:D] (3(ABc) |: d2F2 A2D2 | G2GF E4 | c2E2 G2"_=C"E2 | D2FE D4 | d2F2 A2D2 | G2GF E4 | ABcB AGFE | 
 D2FA d2 z2 :|  