Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:4/4
K:G
['GABc defa g2 dc BG G2 FGAB', 'dcBc dg (3fga']  
X:1
L:1/8
M:4/4
K:G
 GABc defa | g2 dc BG G2 | FGAB cedc | BGAG F2 D z | GABc defa | g2 dc BG G2 | FGAB cAGF | 
 DGGF G2 z2 :| (3Bcd de dcBc | dg (3fga gfdB | cBcd cAFA | cAFA DABc | d^cde dcBc | dg (3fga gfdc | 
 (3Bcd gd cAGF | DGGF G2 z2 | (3Bcd de dcBc | dg (3fga gfdB | cA A2 ceag | fd d2 (3cBA Bc | 
 dB B2 dcBc | dg (3fga gfdc | (3Bcd gd cAGF | DGGF G2 z2 ||  