Create a musical composition following the given alphabetical pattern and incorporating the provided motif.
X:1
L:1/8
M:2/4
K:Bb
['z f']  
X:1
L:1/8
M:2/4
K:Bb
 B | f>fgf | d2 z f | ffgf | e2 z f | ffgf | a/a/azf | ffgf | b/b/bzf | ffgf | d2 z f | ffga/a/ | 
 b2 z |]  