Develop a musical arrangement using the specified sequence in alphabetic representation and the provided motif.
X:1
L:1/8
M:3/2
K:Bmin
['g3 a']  
X:1
L:1/8
M:3/2
K:Bmin
|: ABfB g3 a fedB | B2 fB g3 a (3efe dB | BffB g3 a fedB | e2 dc Aedc AEDE :|  