Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:4/4
K:A
['cB Acdg a2 aB GA-', 'A2 cB ABcd e([Ae-] [ce]2) |2 GA-', 'cB Acef ag a2 A4', 'cB ABcd e2 c2 A4']  
X:1
L:1/8
M:4/4
K:A
|: cB | Acdg a2 aB | | GA- A2- A2 :: cB | ABcd e([Ae-] [ce]2) | |2 GA- A2- A2 |: cB | Acef ag a2 | 
 | A4 A2 :: cB | ABcd e2 c2 | | A4 A2 :|  