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:Bb
['c c']  
X:1
L:1/4
M:4/4
K:Bb
 d c | e3/2 d/ f e | g f e d | c c e3/2 d/ | d2 d =e | d ^c =c3/2 c/ | d c f B | f A c3/2 B/ | 
 A2 c d | e3/2 e/ f3/2 e/ | e d d e | f3/2 B/ g f | e2 e _d | c c e3/2 _d/ | _d c c c | c d e c | 
 f2 e d | g c f3/2 A/ | B2 |]  