Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:4/4
K:Amin
['(e>.d) (e<g) a2 ug>vd (e<g)', '(a<b) a2']  
X:1
L:1/8
M:4/4
K:Amin
 ua | vA<uA (e>.d) (e<g) a2 | ug>vd (e<g) (d>.A) (B<G) | vA<uA"^4" (e>.d) uB>vd(ue>.a) | 
 (g>.a)({ga} b>.B) (B<A)(Aa) | vA<uA"^4" (e>.d) (e>.d) (e<g) a2 | ug>vd (e<g) d>c (B<G) | 
 vA<uA"^4" (e>.d) uB>vd(ue>.a) | (vg>.a)({ga} b>.B) (B<A) A2 |] (A>.a)(a>.g) (a<b) a2 | 
 (g>.a)({ga} b>.a) (g>.e)(g>.d) | (e>.a)(a>.g) (e<g)(a>.b) | (g>.a) (b>.B)"^SEGUE" (B<A) A2 | 
 A>a a>g (a<b) a2 | g>a{ga} b>a g>eg>d | e>aa>g (e<g)a>.b | g>ab>B (B<A)A |]  