Develop a musical arrangement using the specified sequence in alphabetic representation and the provided motif.
X:1
L:1/8
M:2/2
K:Bb
['AcFA Bdfa', 'B2 uAB cf=eg eagb af (3(gab) (af)ga']  
X:1
L:1/8
M:2/2
K:Bb
 uF2S | B2 (3(dcB) AcFA | Bdfa bfdB | GBgf e(dcB) | (3cdc (3BAG FGAc | BdcB AcFA | Bdfa bfdb | 
 gecA FBAc | B2 d2 B2 :| uAB | cf=eg eagb | af (3(gab) (af)ga | (ba)gb (ag)fa | 
 (3gag (3f=ed c2 A2 | Bdfb Acfa | Gc=eg fcAc | dbag f=ede | f(=efg) (3fgf (3_edcS"_D.C." |]  