Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:9/8
K:G
['GBG AGE', 'GAG GAB']  
X:1
L:1/8
M:9/8
K:G
 GBG AGE EDD | GBG AGE c2 A | BAG AGE EDE | GED DEF G3 :| GAG GAB dBG | ABA ABd e2 g | 
 GAG GAB dBA | GED DEF G3 | GAG GAB dBG | ABA ABd e2 f | gag gfe dBA | GED DEF G3 ||  