Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/4
M:3/4
K:G
['d B', 'd B']  
X:1
L:1/4
M:3/4
K:G
 B | B2 d | e2 f | g a g | g f e | d B g | g f e | d B e | E2 F | G A G | d B G | A B d | 
 e3/2 f/ g | d/ B3/2 G | B3/2 c/B/A/ | G3/2 A/ F | E2 || B | e f e | e d B | g a g | g f e | 
 d B g | g f e | d B e | E2 F | G A G | d B G | A B d | e3/2 f/ g | d/ B3/2 G | B c A | G A F | 
 E2 ||  