Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/4
M:4/4
K:C
['G B']  
X:1
L:1/4
M:4/4
K:C
 D | G B B d | d3/2 B/ G B | c/ c3/2 B3/2 A/ | G2 z D | G B B d | d3/2 B/ G B | c3/2 c/ B3/2 A/ | 
 G2 z d | d3/2 B/ A3/2 c/ | B G G B | A D D3/2 D/ | G A B G | c d e3/2 d/ | c/B/A/ G3/2 d/ | B | 
 A D D3/2 | D/ | A B | G c d !fermata!e | d c/B/ A G | d B G !fermata!G |]  