Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:2/4
K:Bb
["c' d'"]  
X:1
L:1/8
M:2/4
K:Bb
 b b2 c' | d' f' d' c' | d' b c' d' | b4 | f' f' f' d' | c'4 | b b a g | f4 | b g f2 | b d' c' b | 
 g b f2 | g f d c | B2 G c | B4 |]  