Construct a melodic piece using the alphabet-based musical sequence and the given motif.
X:1
L:1/16
M:3/8
K:Bb
['B4 cd']  
X:1
L:1/16
M:3/8
K:Bb
 B4 cd | B6 | F4 GA | B6 | e4 dc | d6 | A4 GF | F6 | d4 ed | c6 | c4 Bc | d6 | B4 cd | G6 | A4 GF | 
 B6 | B4 cd | G6 | A4 GA | B6 ||  