Develop a musical arrangement using the specified sequence in alphabetic representation and the provided motif.
X:1
L:1/8
Q:1/4=140
M:4/4
K:Bb
['B2 bB b2 a2', 'B2 d/e/f/g/ fb f/e/d/e/ fF g/f/g/a/ gG']  
X:1
L:1/8
Q:1/4=140
M:4/4
K:Bb
 B2 bB b2 a2 | g2 Gg f2 F2 | e2 ge gb fd | c2 B>c A2 (GF) | B2 bB b2 a2 | gG Gg f2 F2 | 
 e2 gb fd cg | fB (ed/c/) c2 B2 :: d/e/f/g/ fb f/e/d/e/ fF | g/f/g/a/ gG g/f/g/a/ gb | 
 f/e/d/c/ dc dc df | b/a/g/f/ e/d/c/B/ c/B/c/d/ cF | Bf df df gf | b6 b>a | 
 g/b/a/g/ f/a/g/f/ e/g/f/e/ f/b/e/d/ | cf d(c/B/) B4 :|  