Compose a piece using the alphabetic notation of the assigned musical structure and the provided melodic motif.
X:1
L:1/8
M:4/4
K:G
['DGBd gdBd', 'd2 d2 B3 B cBcA']  
X:1
L:1/8
M:4/4
K:G
|: DGBd gdBd | cBcA BdBG | DGBd gdBd | cBcA G4 :: d2 d2 B3 B | cBcA BdBG | d2 d2 B3 B | cBcA G4 :|  