Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:2/2
K:Bb
['A B2 AG d2 cd edcB A2', 'd2 (ed)(cB) A2']  
X:1
L:1/8
M:2/2
K:Bb
 A | B2 AG d2 cd | edcB A2 (AB) | c2 (BA) (Bd) (gd) | (cB) (AG) G3 :: A | B2 (Bc) d2 (de) | 
 f2 (ed) c2 F2 | (BA) (Bc) d2 (gf) | (ed)(cB) B2 d2 | ^B2 B2 B2 ^c2 d2 | (ed)(cB) A2 (g^f) | 
 g2 (dc) B2 d2 | (ed)(cB) A2 d2 | (cB) (AG) G3 :|  