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:D
['D GB/G/', 'F>G GA,/C/ ED', 'c/d/e/f/ gf']  
X:1
L:1/8
M:2/4
K:D
 D |:"D" FA/F/"G" GB/G/ |"D" Ad F>G | AB/A/"A7" GA,/C/ |"D" ED F/E/D | FA/F/"G" GB/G/ |"D" Ad F>G | 
 AB/A/"A7" GA,/C/ |1"D" ED D2 :|2"D" ED DF |:"D" A2 A/F/A/d/ | f>e dc |"G" B>A GF | G3 c/d/ | 
"A" e2 e>f | ed cB | Ac/B/"G" GB/A/ |"D" F3 F | A2 A/F/A/d/ | f>e dc |"G" Bg g/f/g/a/ | b3 b | 
"D" ab/a/"G" ga/g/ |"D" fg/f/"Em" e>d |"A" cA B/A/B/c/ |1"D" d3 F :|2"D" d3 A |:"D" d>f ag | 
 f2- fe/d/ |"A" c/d/e/f/ gf | e3 d | c/d/e/f/ gf | e>d cB | Ac/B/"G" GB/A/ |"D" F3 A | d>f ag | 
 f2- fe/d/ |"A" c/d/e/f/ gf | e3 d | c/d/e/f/ gf | e>d cB | Aa A/c/e/c/ |1"D" d3 A :|2"D" d3 |]  