Create musical compositions adhering to the given structure and incorporating the provided musical concept.
X:1
L:1/16
M:2/4
K:Bb
['B2dB c2ec dbag', 'b2B2B2 de fdfd f2bf gege g2bg fdfd'  
X:1
L:1/16
M:2/4
K:Bb
 dc | B2dB c2ec | dbag f2ed | e2ge d2bd | cBcd c2dc | B2dB c2ec | dbag f2df | gefg a2gf | b2B2B2 :: 
 de | fdfd f2bf | gege g2bg | fdfd f2bd | c=Bcd c2dc | B2dB c2ec | dbag f2df | gefg a2gf | 
 bBBB B2 :|  