Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/4
M:3/4
K:F
['B A', 'e _e2 d d f f f/=e/']  
X:1
L:1/4
M:3/4
K:F
 c2 A/F/ | G B A | C B A |{A} G2 F | g2 e/c/ | a2 f/d/ | (3e/f/g/ d ^B | c3 :: c _e e | _e2 d | 
 d f f | f/=e/ e2 | c b a | g f/e/ f/c/ | (3d/c/B/ A B/G/ | F3 :|  