Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:6/8
K:D
['A2 A G2']  
X:1
L:1/8
M:6/8
K:D
|: FGA d2 d | cBA BFB | A2 A G2 G | FEF AGE | D3 dBd | cAc BGB | A2 A G2 F | EDC D3 :|  