Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/4
M:6/4
K:E
['E3 G2 A B G E e2', 'B c/d/ e c']  
X:1
L:1/4
M:6/4
K:E
 E3 G2 A | B G E e2 B | c/d/ e c B A/G/F/E/ | F3 B,3 | E3 G2 A | B G E e2 d | c/d/ e c f d B | 
 e3 E3 :: g3 e d/c/ B | e3 e2 B | c/d/ e c B A/G/F/E/ | F3 B,2 f/g/ | a3 e3 | f/g/ a/g/f/e/ d2 B | 
 c/d/ e c f d B e3 E3 :|  