Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
Q:1/4=180
M:4/4
K:G
['d2 BG']  
X:1
L:1/8
Q:1/4=180
M:4/4
K:G
|: z2 |"G" g4"D" f4 |"C" ed ef e2"D" d2 |"G" BG Bd"C" e2"D" d2 |"G" BG Bd"C" e2"D" f2 | 
"G" g4"D" f4 |"C" ed ef e2"D" d2 |"G" BG Bd"C" e2 d2 |"D" B2 A2"G" G2 :: Bc |"G" d2 G2 GA GD | 
"D" F2 A2 A3 d |"C" e2 AA e2 AA | e2 d2"D" BB c^c |"G" d2 G2 GA GD |"D" F2 A2 A4 |"C" e2 d2 Bc dB | 
 A2 G2 G2 :|  