Construct a musical arrangement that blends the supplied motif while maintaining the specified alphabetical order.
X:1
L:1/8
M:3/4
K:G
['Bc cB cd AB BA Bc GA', 'fg dB']  
X:1
L:1/8
M:3/4
K:G
|: Bc cB cd | AB BA Bc | GA AF Ae | dc BA GD | Bc cB cd | AB BA Bc | GA AG AB | G4 D2 :: fg dB Gd | 
 fg dB GB | dc cA FA | ed dB Gd | fg dB Gd | fg dB GB | dc cA FA | G4 z2 :|  