Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:6/8
K:G
['', 'GBA G2', '', 'dBG GFG dBG |1,3 BAA A2 :|2,4']  
X:1
L:1/8
M:6/8
K:G
"^A" |: D | GBA G2 A | Bdg Bdg |1,3 GBA G2 B | AFD AF :|2,4 ecA dBG | cAF G2 :|"^B" |: d | 
 egf g2 f | ege dBG | GFG dBG |1,3 BAA A2 :|2,4 cAF G2 :|  