Build a musical arrangement using the indicated alphabet-based system and the given motif.
X:1
L:1/8
M:2/4
K:Bb
['B2 dB', 'B2 dB', 'B, f2 (f/g/a) fdcB g2 g/a/b gedc']  
X:1
L:1/8
M:2/4
K:Bb
 F | B2 dB | cAGF | B2 dB | c2 e2 | B2 dB | cAGF | GBAc | B2 B, :: F | B2 dB | cece | B2 dB | 
 cAGF | B2 dB | cece | dcBA | B2 B, :: f2 (f/g/a) | fdcB | g2 g/a/b | gedc | f2 f/g/a | fdcB | 
 ecBA | B2 B,2 :|  