Develop a piece of music conforming to the stated structure and theme.
X:1
L:1/4
M:4/4
K:Bb
['B2 c2']  
X:1
L:1/4
M:4/4
K:Bb
 B F | B2 c2 | d3/2 e/ f f | e2 d2 | c2 c c | c2 d2 | B2 c B | A2 G2 | F F B A | B2 c2 | d f e e | 
 d2 c2 | B2 |]  