Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:2/2
K:Bb
['BABc BFdc', 'BABc BFdc'  
X:1
L:1/8
M:2/2
K:Bb
 dc | BABc BFdc | BABc BFdc | Bcde fBgf | edcB AFGA | BABc BFdc | BABc BFdc | BfdB AFGA | 
 B2 d2 B2 :: AB | cAFA cAdB | ecAc edgf | edc=B cGc_B | Af=eg fd_ec | BABc BFdc | BABc BFdc | 
 BfdB AFGA | B2 d2 B2 :|  