Assemble a musical composition that combines the featured motif and conforms to the defined alphabetical form.
X:1
L:1/8
Q:3/8=120
M:6/8
K:Bb
['BbB BbB BaB BaB BgB BgB', 'e2 z']  
X:1
L:1/8
Q:3/8=120
M:6/8
K:Bb
 BbB BbB | BaB BaB | BgB BgB | g3 f3 :| Bcd Bcd | e2 z d2 z | cde cde f2 z e2 z | dcB bag | 
 f3 e2 c | Bed c2 B | B3 B3 :|  