Develop a music arrangement by incorporating the given alphabetical sequence and the provided motif.
X:1
L:1/8
Q:1/2=100
M:4/4
K:Bb
['c2 BA', 'c2 cd e2']  
X:1
L:1/8
Q:1/2=100
M:4/4
K:Bb
 f2 ed c2 d2 | edcB c2 BA | B2 AG F2 B2 | G2 FE D2 d2 | B2 AG c4 | F2 GA BAGF |1 F8 :|2 F6 |: A2 | 
 c2 BA Bc d2 | GA B2 G2 z2 | e2 z2 f2 ed | c=B c2 cd e2 | c2 cd e2 dc | d2 cB AB c2 | F2 z2 de f2 | 
 B2 z2 Bc d2 | G2 A2 B2 AG | F2 B2 Bc d2 | B8 |]  