Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:6/8
K:Amin
['A,2 A, C2 A,', 'A,3 E2 A B2 B cBA G2']  
X:1
L:1/8
M:6/8
K:Amin
|: A,2 A, C2 A, | A,2 E D2 D | A,2 A, C2 A, | A,GE DCG, | A,2 A, C2 A, | A,2 E FAc | dcA GFD | 
 E G,2 A,3 :: E2 A B2 B | cBA G2 G | ABc e2 e | ged c2 B | cde ^f2 ^g | a3 a3 | age dcG | AcB A3 :|  