Produce a musical expression that follows the indicated alphabetical structure while integrating the provided thematic material.
X:1
L:1/4
M:2/4
K:A
['B c', 'g f']  
X:1
L:1/4
M:2/4
K:A
 e f/e/ c e/c/ | B E A3/2 c/ | B A A B | c B B c | e f/e/ c e/c/ | B E A3/2 c/ | B A A B | 
 c A A2 :: e f/g/ a3/2 a/ | g f f g/f/ | c e f g | f e e2 | e f/g/ a3/2 a/ | g f f g/f/ | c e f g | 
 a a :|  