Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:4/4
K:D
['DFAF GBdB Acec dfaf gbed ceAF', 'Adcd fdcd baga fdcd AdFA DFAF']  
X:1
L:1/8
M:4/4
K:D
 A2 | DFAF GBdB | Acec dfaf | gbed ceAF | GBED CE A,2 | DFAF GBdB | Acec dfaf | gbed ceAF | 
 GBEC D2 :| FG | Adcd fdcd | baga fdcd | AdFA DFAF | GFED CE A,2 | Adcd fdcd | baga fdcd | 
 AdFA DFAF | GFEC D2 :|  