Compose music by following the designated structure and integrating the suggested musical idea.
X:1
L:1/8
Q:1/2=90
M:4/4
K:Bb
['dc BFDF B2', 'B2 dc BFDF'  
X:1
L:1/8
Q:1/2=90
M:4/4
K:Bb
 dc | BFDF B2 dc | BFDF B2 dB | cBcd edcB | Ac f2 f2 dc | BFDF B2 dc | BFDF B2 dB | efgf edcB | 
 d2 B2 B2 :: fe | defd gfed | e2 c2 c2 ed | cdec fedc | d2 B2 B2 dc | BFDF B2 dc | BFDF [Bb]2 bf | 
 gfed fecA | c2 B2 B2 :|  