Construct a musical piece using the designated motif and sticking to the alphabetical form presented.
X:1
L:1/8
M:2/4
K:Bb
["b d'"]  
X:1
L:1/8
M:2/4
K:Bb
 c'3/2 c'/ b d' | c'3/2 b/ c'2 | d'3/2 f'/ c' b | g3/2 f/ g2 | b b2 c' | d' c' d' a | g g/ g/ a g | 
 f d f2 | d/ f/ d/ f/ g2 | c'2 d' c' | b d' g f | e3 f | g g/ b/ f e | c4 |]  