Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:6/8
K:G
['BAG AGF', 'bag agf', 'G Bc dBG GFG dBG GAB cA=F']  
X:1
L:1/8
M:6/8
K:G
 dc | BAG AGF | DGE FGA | BAG Bcd | cAG Fdc | BAG AGF | GBd gag | fed gdB | cAF G :| Bc | dgg gfg | 
 abg fga | bag agf | def g2 a | bag agf | gag fd^c | def gdB | cAF G :| Bc | dBG GFG | dBG GAB | 
 cA=F FEF | cA=F ABc | dBG GBd | gag fd^c | def gdB | cAF G :|  