Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
Q:1/8=128
M:4/4
K:Bb
['fd b2']  
X:1
L:1/8
Q:1/8=128
M:4/4
K:Bb
|: F | Bc/e/ BF Bc/d/ BF | d>c B<d cC Cc | Bc/d/ BF Bd/f/ d<B | d>c BA BB, B,F | 
 Bc/e/ BF Bc/d/ BF | d>c B<d cC Cc | Bc/d/ BF Bd/f/ d<B | d>c BA BB, B,d/e/ | fd b2 fd b2 | 
 fd bd gc cd/e/ | fd b2 a/g/f/e/ d/c/B/A/ | BG F/G/F/E/ DB, B,d/e/ | fd b2 fd b2 | fd bd gc cd/e/ | 
 fd ec dB cA | B<G F>E DB, B, :|  