Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
Q:1/8=128
M:4/4
K:Bb
['D>B, D>F']  
X:1
L:1/8
Q:1/8=128
M:4/4
K:Bb
|: F | D>B, D>F B>d B>F | D>F B>d c<C C>F | D>B, D>F B>F B>d | f>B e>c d<B BF | D>B, D>F B>d B>F | 
 D>F B>d c<C C>F | D>B, D>F B>F B>d | f>B e>c d<B Bg | f>B d>B B>f d>f | g>c e>c A>g e>g | 
 f>B d>B B>f d>f | c>B A>G F<B B>g | f>B d>B B>f d>f | g>c e>c A>g e>g | f>d e>c d>B c>G | 
 F>f c>A d<B B :|  