Compose a piece using the specified musical pattern based on the alphabet notation and provided melodic motif.
X:1
L:1/16
M:2/4
K:Bb
['FG Bc d2cB']  
X:1
L:1/16
M:2/4
K:Bb
 F2 | B2B2B2 FG | _A2A2 G2 z F | FG Bc d2cB | c6 .F.F | B2dd e2f2 | ed cB G2FG | BBB2 D2FG | 
 _A4 G2 z G | FG Bc d2cB | B6 ||  