Compose a piece of music following the specified structure and theme.
X:1
L:1/8
M:4/4
K:Bb
['B B']  
X:1
L:1/8
M:4/4
K:Bb
 F2 | B2 B B F2 F F | D2 F2 B,3 F | B2 B B c2 Bc | d6 d2 | e2 c2 d2 B B | c2 BA B3 F | 
 F2 F F2 G A2 | B6 c2 | d6 F2 | F2 F2 F2 GA | B6 z2 |]  