Develop a piece of music conforming to the stated structure and theme.
X:1
L:1/8
Q:1/2=100
M:2/2
K:Bb
['B B3 g f3 e d3 e', 'd e3'  
X:1
L:1/8
Q:1/2=100
M:2/2
K:Bb
 B | B3 g f3 e | d3 e c3 d | B3 d c3 B | A4 F3 E | D3 F B3 G | E3 G c3 A | F3 f f3 =e | 
"^NB" f4- f3 :: f | f3 b a3 g | f3 e d3 g | B3 d e3 d | c4 c3 f | f3 b a3 b | g3 a f3 g | 
 B3 d c3 B | A4 G3 d | e3 G F3 d | c3 F E3 d | e3 d c3 B | c4 F3 E | D3 F B3 G | E3 G c3 A | 
 F3 B B3 A | B4- B3 :|  