Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
Q:1/4=120
M:6/8
K:G
['A B2 G', 'BAG F2 D']  
X:1
L:1/8
Q:1/4=120
M:6/8
K:G
|: D | G2 A B2 G | c2 A B2 G | G2 A BAG | F3"^tr" TA3 | G2 A B2 G | c2 A B2 G | Bcd cAF | G3 G2 :: 
 c | BAG F2 D | DED D2 c | BAG F2 D | E3"^tr" Tc3 | BAG F2 D | DED D2 c | Bcd cAF | G3 G2 :|  