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
['', 'G2 F2', 'afde fe d2 B4 BABc B2 BB']  
X:1
L:1/8
M:4/4
K:D
 AB |: A2 G2 F2 A2 | f4 f2 ef | g2 fg fe d2 | B4 BAGA | G2 F2 G2 A2 | e4 efed | c2 AB cB A2 |1 
 F4 FGAB :|2 d4- d3 A |: defg a2 aa | a^gab afde | fe d2 B4 | BABc B2 BB | Bdef g2 gg | gfga geAB | 
 cB A2 F4 | FEFG F3 A :|  