Generate a musical piece using the presented motif and follow the alphabetical structure provided.
X:1
L:1/8
M:2/2
K:Bb
['B4 dcBA', 'F4 A2 FAcA FBdB Gcec Acfd Bdgf']  
X:1
L:1/8
M:2/2
K:Bb
 B4 dcBA | B2 B2 B2 F2 | GBAG FEDC | B,2 B,2 B,4 | B4 dcBA | Bd f4 =ed | cf=ed cBAG | F2 F2 F4 :: 
 A2 | FAcA FBdB | Gcec Acfd | Bdgf edcB | A2 F4 ED | E2 g2 C2 e2 | D2 f2 B,2 d2 | cgfe dcBA | 
 B2 B,4 :|  