Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:6/8
K:G
['uD (vG2 .c) BGB (c2 .c) (c2', 'g gdB']  
X:1
L:1/8
M:6/8
K:G
 uD | (vG2 .c) BGB | (c2 .c) (c2 .A) | (G2 .c)"^SEGUE." BGB | A2 A A2 B | G2 c BGB | 
 c2 c c2"^4" e | dBG cAF | G2 G G2 :: ud | (vg2 .g) gdB | (c2 .c) (c2 .e) |"^SEGUE." g2 g gdB | 
 A2 A A2 d | vg2 g gdB | c2 c c2 A | BGB cAF | G2 G G2 :|  