Construct a melodic piece using the alphabet-based musical sequence and the given motif.
X:1
L:1/8
M:9/8
K:D
['a2 f faf b2 g', 'FGA AFA']  
X:1
L:1/8
M:9/8
K:D
 a2 f faf b2 g | g2 e efd cBA | a2 f faf b2 g | faf gec d3 :: FGA AFA BGB | g2 e efd cBA | 
 FGA AFA B2 g | faf gec d3 :|  