Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:2/2
K:C
['Dddc GcEc GcEc FcEc', 'eddf ecgc acgc fage']  
X:1
L:1/8
M:2/2
K:C
 uc"^Segno" | vGcEc Dddc | GcEc GcEc | FcEc DddB | cG"^4"AF EccA | GcEc Dddc | GcEc GcEc | 
 FcEc DddB | cG"^4"AF Ecc |] !fermata!uf |"^0" vecgc"^4" eddf |"^0" ecgc acgc | fage dcd"^4"e | 
 GAcd{cd}"^4" e2 (df) |"^0" ecgc"^4" eddf |"^0" ecgc acgc | fage dcd"^4"e | 
 GAcd{cd}"^4" e2 (dc)"^Segno""_D.S." |]  