Create a composition following the given musical structure and theme.
X:1
L:1/8
Q:1/4=48
M:6/8
K:Bb
['FGB c2']  
X:1
L:1/8
Q:1/4=48
M:6/8
K:Bb
 z3 z2 B/G/ | FGB c2 d | B3- B2 G | FGB c2 d | f3- fdB | FGB c2 d | B3- B2 G | FGB c2 d | f3- fdB | 
 FGB c2 B | B3- B3- | B3- B3- | B3 b2 |]  