Develop a musical composition based on the outlined framework and thematic material.
X:1
L:1/8
M:3/4
K:Bb
['B2 BG FD', 'BA GF GB', 'd2 dc df'  
X:1
L:1/8
M:3/4
K:Bb
 B2 BG FD | Cc cB AF | B2 BG FD | B,B BA B2 :: BA GF GB | Gc cB AF | BA GF GB | FB BA B2 :: 
 d2 dc df | c2 cB Ac | d2 dc df | FB BA B2 :|  