Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
Q:1/4=88
M:3/4
K:Amin
['(BA) ^G2 B2 B2 e2 (BAB^G) (BA^GBAc)', 'd2 e2']  
X:1
L:1/8
Q:1/4=88
M:3/4
K:Amin
"^Andante" (BA) | ^G2 B2 B2 | e2 (BAB^G) | (BA^GBAc) | (Bc)(de)(cd) | (Bc)(dB)(cA) | (^GABcdB) | 
 e2 (dc)(BA) | (A2 ^G2) || (Bc) | d2 d2 e2 | d2 c2 B2 | [Ec]4 [ce]2 | (cdefge) | (defedc) | 
 (BcdcBA) | (G2 ^F2) [B,G]2 | (Bcdecd) | G2 c2 d2 | e2 (dc)(BA) | (A2 ^G2) (AB) | c2 Bc A2 | 
 B4 (cA) | (^GABcdB) | e2 (dcBA) | (^G2 A2) ||  