Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:12/8
K:A
['B c2 c cBA f2 e cec', 'A2 e aga a2 g faf e2'  
X:1
L:1/8
M:12/8
K:A
|: B | c2 c cBA f2 e cec | BcB BAB c2 B A2 B | c2 c cBA f2 e cec | BcB BcB A3 A2 :: e | 
 aga a2 g faf e2 c | BcB BAB c2 B A2 e | aga a2 g faf e2 c | BcB BcB A3 A2 :|  