Construct a musical composition using the provided motif and maintain the designated form.
X:1
L:1/8
Q:3/8=120
M:9/8
K:Bb
['B3 dcB fed', 'f2 (=e/f/)', 'b2 B'  
X:1
L:1/8
Q:3/8=120
M:9/8
K:Bb
 B3 dcB fed | cde GcB AGF | B3 dcB fed | ced cBA B2 z :: f2 (=e/f/) f2 (e/f/) dcB | 
 f2 (=e/f/) fef dcB | f2 (=e/f/) f2 (e/f/) dcB | GBA GF=E F2 z :: b2 B b2 B b2 B | gfe dcB AGF | 
 bbb bbb bag | fed cBA B2 z :|  