Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:4/4
K:G
['BGDG B3 B BAGA BGBd efge B2', 'B BAGA BGBd efge B2 cB']  
X:1
L:1/8
M:4/4
K:G
|: BGDG B3 B | BAGA BGBd | efge B2 cB | AGFG ABcA | BGDG B3 B | BAGA BGBd | efge B2 cB | AGFA G4 :: 
 gfed B3 B | BAGA BGBd | efge B2 cB | AGFG A3 d |1 gfed B2 B | BAGA BGBd | efge B2 cB | AGFA G4 :|  