Develop a musical composition based on the outlined framework and thematic material.
X:1
L:1/4
M:4/4
K:Bb
['d c', 'B A'  
X:1
L:1/4
M:4/4
K:Bb
 d/c/B/A/ G B | A c B d | c e d B | A G =F D | d/c/B/A/ B d | c e d g | f e d c | B2 B,2 :: 
 d/c/=B/d/ c C | c/_B/A/c/ B d | c B A G | A2 D2 | G B A e | d g d B | A G{B} A G/^F/ | G2 G,2 :|  