Compose a piece adhering to the given musical structure and theme.
X:1
L:1/8
M:2/4
K:Bb
['ff b3 c']  
X:1
L:1/8
M:2/4
K:Bb
 ff | b3 c | fcec | b2 fc/e/ | f3 e/f/ | f<cb/g/f/ z/ | ffff | dfdc | fc/d/fd | c3 b | 
 ec/d/c/b/g/f/ | z2 ff | b3 c | fg f2 | c2 fc/e/ | f3 e/f/ | f/ec/b/g/f/ z/ | fc/d/ff | ffdc | 
 fc/d/fd | c3 b | ec/d<bg/ |]  