Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/4
M:3/4
K:Emin
['A A']  
X:1
L:1/4
M:3/4
K:Emin
 A A A | A A A | A A A | A A A | A A A | A A A | A A A A | A A A | A | A | A | A | A | A A |]  