Construct a musical arrangement using the specified alphabetical sequence and the given motif as a foundation.
X:1
L:1/8
M:4/4
K:Bb
['B2 (e/d/c/B/)', 'B2 bfgf bBcB GcBA Acce dfBd GBEg']  
X:1
L:1/8
M:4/4
K:Bb
 FB (e/d/c/B/) f2 B2 (e/d/c/B/) | F2 B2 (e/d/c/B/) Accd | FBdB fdbg | fdcB FB B2 :: bfgf bBcB | 
 GcBA Acce | dfBd GBEg | AcFe dB B2 :|  