Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:3/4
K:Amin
['B2 A2', 'e2 (e2']  
X:1
L:1/8
M:3/4
K:Amin
 E2 | (A4 B2) | c2 B2 A2 | e2 (dc) BA | B4 B2 | A2 (Ac) (Bd) | (c2 B2) A2 | ^G2 (GB) (Ac) | B4 :| 
 B2 | c4 c2 | d4 d2 | e2 (e2 f2) | e4 d2 | (cB) cd c2 | (dc) de d2 | (ed) ef ef | (g3 f) ed | 
 (cB) cd ec | (dc) de fd | e2 (e2 a2) | ^g4 b2 | a2 e2 c2 | f2 e2 d2 | c2 (dc) Bc | A4 ||  