Compose a music piece that includes the specified motif while adhering to the outlined alphabetical sequence.
X:1
L:1/8
Q:1/2=100
M:4/4
K:D
['d2 g2 g2 a2', 'ga b2']  
X:1
L:1/8
Q:1/2=100
M:4/4
K:D
 d2 g2 g2 a2 | b2 ag a2 a2 | d2 g2 g2 a2 | bbag a4 :: ga b2 ga b2 | b2 ag a4 | d2 d2 e3 f | 
 efga f3 g | a2 e2 e2 f2 | e4 d4 :|  