Craft a musical work adhering to the specified theme and structure.
X:1
L:1/8
Q:1/8=128
M:4/4
K:Bb
['B<B B>D']  
X:1
L:1/8
Q:1/8=128
M:4/4
K:Bb
|: d | B<B B>D D/E/F F>d | B<B e>B cC C>c | B<B B>D F2 F>g | f<B d>c BB, B,d | B<B B>D D/E/F F>d | 
 B<B e>B cC C>c | B<B B>D F2 F>g | f<B d>c BB, B,g | f<f f>d f3/2=e/4f/4 b>d | f<f b>d gc cg | 
 f<f f>d f3/2=e/4f/4 g>_e | d>B c>A BB, B,>g | f<f f>d f3/2=e/4f/4 b>d | f<f b>d gc cg | 
 f<f e>c d>B c>A | B>F GB DB, B, :|  