Create a piece of music using the provided alphabetical structure and motif.
X:1
L:1/8
Q:1/2=100
M:4/4
K:Bb
['B2 dB', 'B z f2 dB G2 E2 g2']  
X:1
L:1/8
Q:1/2=100
M:4/4
K:Bb
 F | B2 dB c2 ec | B2 dB AcAF | B2 dB c2 ec | dcBA B2 B :: z | f2 dB G2 E2 | g2 ec A2 F2 | 
 f2 df b2 ge | dcBA B2 B :|  