Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:6/8
K:G
['dBg dBG', 'dBc dBc dBg dBG']  
X:1
L:1/8
M:6/8
K:G
 d3 d3 | dBg dBG | c6 | cAB cBA | d6 | dBg dBG | EGc BcA | G3/2 z3 :: d | dBc dBc | dBg dBG | 
 cAB cAB | cAB cBA | dBc dBc | dBg dBG | EGc BcA | G4 :|  